Fitbit is the largest manufacturer of smart bracelets on the earth, Charge is its most important product line. After the initial generation of Charge and Charge HR, the latest Charge 2 was released at the end of August this year. As the volume product of the giant this year and next, Charge 2 can even be called the vane of the smart bracelet market. It is no exaggeration to say that it is the ceiling of the current sports bracelet. Whether Fitbit can continue to maintain its sales volume and dominance depends largely on how powerful Charge 2 can be.
PS： Considering its importance to the industry, this article is very long, and it is suggested that Love to play computer games On the PC web side, use the floating directory in the lower right corner to jump to the best reading experience. If you only want to see the shortest evaluation, you can go directly to the summary section.
Enterprise background and parameters
After the Xiaomi bracelet opened the "era of 100 yuan bracelet", the smart bracelet has been rapidly popularized in two years. Everyone has begun to forget that there was an era of nearly 1000 yuan bracelets. Now only Fitbit and Garmin are still selling bracelets at an average price of more than 1000 yuan. The former, the largest wearable device manufacturer on the earth, sold 4.8 million products in the first quarter of 2016, with a revenue of $500 million and a total sales volume of 43 million.
Fitbit's positioning spans between sports and fashion. It is more professional than Apple Watch and more fashionable and grounded than highly oriented Garmin. In addition to the body fat scale Aria, in the current product line, whether it is the Zip and One hanging on the body, or the sports bracelet Flex2, Alta and Charge2, or the sports watch Blaze and Sure, they are essentially wearable sensors.
Charge 2 parameters:
Color: black/blue/purple/sky blue, and black and lavender with special diamond pattern
Size: small watch band 140-170mm perimeter; Large watch band 170-206mm perimeter; Extra large watch strap 206-236mm perimeter;
Screen: OLED dot matrix
Sensor: MEMS 3-axis accelerometer, altimeter, PurePulse optical heart rate sensor
Functions: step counting, sleep monitoring, all-weather heart rate detection, breathing guidance, vibrating alarm clock, message push
Protection grade: anti sweat, anti splash, can not be immersed in water, recommended when not bathing
Endurance: about 5 days
Price: 898 yuan (Jingdong)
Appearance and workmanship
The outer packaging of Fitbit Charge 2 is a very detailed product introduction, which uses a special "drawer box". Pull out the outer layer, open the magnetic cap, and the machine will lie quietly. Each accessory has a handle for easy picking up. The whole unpacking process is like opening a gift. The accessories are very simple. Apart from the machine body, there are only charging lines, safety instructions and instruction cards printed only with the website.
The official Fitbit provides a total of four colors, namely black/blue/purple/sky blue, and black and lavender with special diamond patterns, while we get the sky blue Fitbit Charge 2. The front of the machine is a pure black panel. The buckle on the frosted surface is printed with logo. The material is different from the strap. There is a slight color difference and it is slightly hard. Sadly, this material is easier to change color than the watchband. After half a month of use, it has turned yellow to some extent.
The Fitbit Charge 2 screen only occupies about half of the main body area, and is not symmetrically placed. Fortunately, the screen body is dark enough to avoid the large gray screen problem of low-end mobile phones. Fitbit Charge 2 adopts surgical grade stainless steel frame, with general thickness control. On the left side of the fuselage is the mode switch button, which is also the power on/restart button.
Fitbit Charge 2 is the first product in the Charge series to use a replaceable watch strap. It can solve the previous durability problems such as degumming and aging by changing the watch strap. This improvement is an important reason why many computer users began to consider Fitbit Charge 2. After all, no one wanted to wear such an expensive bracelet for a few months.
The machine is fixed in the form of sliding buckle, sliding into the slot from the inside to the outside for fixation, and pressing the inside buckle can remove the watch strap, which is simple and violent in design. Although this design leads to the poor fit between the body and the strap, the tightness is acceptable, without too much weight increase. There is no pattern on the inner side of the watchband. The rubber watchband is soft, and the handle of the fine sanding treatment on the inner side is quite good.
Comparison of Xiaomi bracelet 2, Fitbit Charge 2, Apple Watch and ticwatch2 heart rate sensors
The back of the fuselage is one of the biggest selling points of Fitbit Charge 2's heart rate sensor, which is not only huge but also prominent. The receiver module in the middle is several circles larger than that of similar products. The light-emitting LEDs at the upper and lower ends, even without the scattering optical structure of Apple Watch, are also conspicuous.
The middle frame of the Fitbit Charge 2 is made of metal. The authentication information of the electronic device is hidden at the interface. The opening of the air pressure sensor is also hidden on the side of the middle frame. The overall workmanship of the machine is good. The connection between the screen and the back heart rate sensor and the metal frame is very tight, giving a strong impression of durability.
Wear and contrast
Fitbit series products have always used a wide watchband. Fitbit Charge 2 has maintained the same watchband width as the original Fitbit Charge. The width of the watchband is close to that of the Apple Watch with a 24mm watchband and wider than that of the ticwatch 2 with a 20mm watchband. The horizontal bounty allows the core part to be shorter and the starting part of the watch strap to fit the wrist more closely. The thickness and prominence control are better than the Xiaomi bracelet 2.
The wearing feeling of wearing products varies from person to person, because the buckle distance is fixed, and the wrist diameter of some people may be just sandwiched between two clips, leading to users' completely different evaluations of the wearing comfort of the same product. In case of "the last detent is too loose and the next one is too tight", you can try to wear it with another hand. The left hand was too wide/narrow, perhaps the right hand with different thickness would have unexpected effects.
Apart from the tightness, the wearing feel is mainly affected by the following three factors:
Weight and weight distribution, Fitbit Charge 2 The weight distribution is relatively uniform, but the metal material and the wide watchband make the bracelet overall heavy, and there is a certain drag feeling when rotating the wrist at high speed;
appearance ， The back of Fitbit Charge 2 does not fit the wrist radian, in order to Try to ensure that heart rate detection is not affected by external light and shaking, The protruding heart rate sensor can be "embedded" in the wrist and "propped up" the whole wrist ring (reducing the contact area). This is the design that almost all similar products that look at the function of center of gravity rate are "forced" to adopt, and the heart rate sensor is also required to wear tightly, resulting in a general decline in the wearing comfort of the heart rate bracelet;
Air permeability, The heart rate sensor with many bulges and the hardness of the wide watchband make the Fitbit Charge 2 actually "suspended" at ordinary times. The contact surface is mainly one or two positions of the heart rate sensor and the watchband. Even if the watchband has no grooves and holes, it also has good air permeability;
During use, the Fitbit Charge 2 is comfortable to wear. Although it is not as good as the original Charge without a heart rate sensor bulge, it is still at the upper level in the bracelet. Even if the wearer is sweating heavily, his wearing feeling is not much worse than that of the Xiaomi bracelet, a narrow watchband with light weight. However, the wide watchband and the "towering" new heart rate sensor will have an obvious foreign body feeling when wearing long sleeves or backing against the hand. In addition, it should be noted that the size indication on the official website should be clear before purchase. The L size is too large, and the author's 180 height Thin The machine guy, almost can't wear it (the penultimate detent is just right).
Screen&Vibration&Bluetooth&Storage
Screen: Charge 2 is equipped with a white light dot matrix OLED screen, and the "big fruit" pixels are obvious from a distance. Users who are used to seeing the high-definition screen may dislike its shortcomings. Its main improvement is area, so that the screen can display more content and more detailed push information. The brightness of this screen is fixed, and you can see the screen directly in strong sunlight, but at the cost of dazzling in the middle of the night;
Vibration: The vibration amplitude of Charge 2 is stronger than that of Charge, which is similar to that of Xiaomi bracelet series products, but the convex heart rate sensor has played a shock buffer role, and the final effect of shaking the alarm clock is general. Users who sleep heavily need to set more alarm clocks;
Bluetooth signal, the smaller the negative value, the stronger the signal
Bluetooth connection: Charge 2 BLE wireless connection is adopted. The latter is an optional component of Bluetooth 4.0, which is not supported by all Bluetooth 4.0 devices. Although the middle and high-end mobile phones of a year or two ago all have this capability, it is better to go directly to the official website The actual Bluetooth strength of Charge 2 is stronger than that of Xiaomi Bracelet 2 and ticwatch2, but the incoming call push cannot work when it is about 7 or 8 meters away from the mobile phone (the test machine is Note5, the national bank ROM, and the underlying Android 6.0). The connection speed with Bluetooth is normal at ordinary times, and many Fitbit users are suffering from the problem of speed synchronization. The main reason is the access speed of the Fitbit official website. Bluetooth said it is not easy.
Storage: The storage size will affect the duration of independent work of the wearable device. If the storage size is too small, the mobile phone must be frequently connected to export data. Charge 2's Ample storage space, Can record 7 days of minute level precision data, 3 days of SmartTrack data and 30 days of total data. If there is less exercise, synchronization every 5 or 6 days can also ensure data security. However, it should be noted that in the exercise mode, the heart rate data is stored by seconds, and the limit is Store 10 hours of data. And when the limit is exceeded, the detailed data during the whole exercise period will be cleared. If you have more exercise, you'd better synchronize with your mobile phone in time.
Built in system App and web side
Function Card
System structure and interaction ： The Charge 2 system consists of five function cards: "dial, running, stopwatch, breath guidance and alarm clock". The app can switch the cards and change the order. The side button or double click the body switch card, and long press the trigger and stop functions. This is the interaction of all functions of the whole bracelet.
Charge 2 is one of the few products that put the alarm switch on the bracelet. Tap to view multiple alarm clocks, and long press to pause or start the alarm clock. But I have to complain that after each function is used up, it will not automatically bounce back to the schedule disk.
clock dial: Double click to switch to display exercise data such as heart rate/steps/distance, There are 7 official dials, very few, but two dials directly display real-time heart rate. Even without turning on the sport mode, you can see your heart rate at any time by raising your hand. Now only Fitbit and Garmin products can do this function.
Speed and stability: Charge 2 has a fast response to the operation, but the modification of settings and synchronization of data must go through the Fitbit official website, and the access speed of the latter will directly affect the speed and stability of modifying the bracelet settings. In half a month of use, I have encountered the problem that the dial suddenly restores to the original setting, and the light is slow when I raise my hand. The former automatically restores after half a day (error occurs during setting synchronization), and the latter has to change the dial again to revive.
App client
The characteristics of Fitbit on the software side are its super wide platform coverage and detailed use help:
Bluetooth adapter for Charge 1
In addition to Android, iOS and Win10, the three major mobile systems all have corresponding apps, and Fitbit is estimated to be the only smart bracelet manufacturer with PC software (but it really only has synchronization function). Previously, Fitbit even attached a USB Bluetooth receiver for PC, but the utilization rate of the latter was too low. This year's products are no longer attached, and users in need have to buy additional.
The instructions on the official website are listed in the form of questions. Although there is a strong sense of machine translation in some places, the level of detail is unparalleled There are more than 20 explanation questions and answers for common troubleshooting, It will recommend which third-party app the user uses to locate the machine The water should be stuffed into the rice for 24 hours.
Home page and setting page
Continuously recorded heart rate, step counting and sleep statistics page
App , except that the function of "raising your hand to light up" is translated into "quick check", which is rather confusing, its completion is very high, It has its own fade in and fade out animation and font, which will be very fresh on Android platform. app Mainly based on data display, it lists "steps, distance, heart rate, sleep, floor, active time" and other data, as well as health-related "calorie intake, drinking water and weight information", but can only be entered manually (buy Fitbit's own body fat scale Aria to solve the weight information). Slide left and right to view the information of different dates, and click the category to view the details and related settings.
Its app's The biggest problem is synchronization speed and stability Although the push function of the latest version at the deadline was stable, a large number of users reported that the data synchronization speed became very slow. On the test machine Note5, the previous version had an unstable push function. A large part of this is related to the slow access of the Fitbit website in mainland China. During activation and reconnection, the loading of demo images and thumbnails is relatively slow, and new users may be confused when looking at a white page that has not yet been loaded.
Myfitnesspal and endomondo
In terms of data interchange, The most unacceptable thing for domestic users is that it does not support WeChat, and data cannot be synchronized to WeChat sports rankings ！！！ In addition, Fitbit It has been unable to connect directly with the health applications of Apple, HTC and other manufacturers (iOS can synchronize through the paid software Sync Solver, and Android can't do anything). Now, only those who can read Fitbit data can Myfitnesspal (for weight loss) and endomondo (for exercise and running) are a few software programs, and they are basically just for strengthening fitness programs, which are of no use to ordinary users. It is possible to access IFTTT (automatic processing, triggering other network services through data), which will be more useful for many advanced users.
Web side
Personal page on webpage side
Web side details
Web version On the other hand, Fitbit was the strongest among its peers two years ago, and it is still the strongest, and may be the strongest in the future (after all, many of its peers have abandoned the web side, or even never had a web side at all). The data details on the web side are intuitive, detailed and domineering, and the data maniac is very satisfied (squint). In addition, The functions on the mobile phone app are endless, and all the detailed settings can be modified on the webpage. As long as the bracelet is connected to the mobile phone, the background can be synchronized silently.
But the situation of the web side is close to Google Now, and there is a serious problem of access speed in China, which also existed nearly two years ago. The connection speed of its official website mall, help page and forum is not fast, but it is acceptable. On the contrary, the access to the core personal data page is very unstable, even if it can be connected, it is also very slow. The consolation is that after the loading is completed, the operations in the web page will not be affected by the access speed
Functions: step counting/sleep/heart rate/message pushing/vibrating alarm clock
Raise your hand to see the time
The first generation of smart bracelet only added pedometers and vibrators, while the bracelet with time display is the second generation in a broad sense. It can be used as a watch to see the time, which is an important reason why many non fitness users can still insist on wearing bracelets in addition to their clothes. In order to control power consumption, almost all bracelets will have the function of "raising hands to light the screen". Its sensitivity directly determines the availability of the function of watching time and whether users can adhere to daily wear.
Charge2、 Xiaomi bracelet 2, Samsung Gear Fit2 ticwatch 2
The assessment points for raising hands and lighting the screen are mainly "wrist turning strength requirements, sensitivity, lighting speed and false touch control". The screen display of Charge 2 is the first echelon in the smart watch/bracelet. It is close to Apple Watch and Samsung Gear Fit 2, and almost lights up when walking. It also recognizes the movement of wrist turning and the position of the dial. It requires very light force and can also recognize when turning slowly. It supports turning the hand to turn off the screen (the surface faces outward and automatically turns off the screen).
Its disadvantage is that the tilt angle is required to be large. Although the surface can be lit up within 30 degrees outward, the roll angle must be below 40 degrees, otherwise the machine will think that this is a vertical hand and will not respond. Occasionally, when you sit sideways to see the time, you will find that the bracelet does not light up... This general defect is that when you turn your wrist when you lie down, you will not light up the screen. However, the author has been quite satisfied after using countless wearable products that raise their hands to brighten the disabled.
Message push and vibrating alarm clock
Charge 2 supports three types of push: phone, SMS and calendar notification (the calendar app can be customized on Android, while iOS can only use its own calendar). In order to protect privacy, the machine first vibrates and does not light up the screen, and then displays the content within one minute after raising your hand. This is a setting that domestic products do not have. The incoming call will scroll to display the name and number of the incoming call for 4 times. The physical button can hang up the call. It is very practical to hang up the harassing call when commuting. Just this moment's appearance will make you feel that it is worth charging every 5 days.
SMS and calendar will scroll to display the sender and schedule for two times, with a maximum length of 40 characters. Because scrolling is too slow, it can only be used to confirm who the sender is. Even the verification code is too slow. In addition, the current version of the firmware is weak in Chinese, and the character that cannot be displayed is "□". In addition, the push may be unstable on some models, so the availability of this function is very low.
In terms of vibrating alarm clocks, up to 8 alarm clocks can be stored. After the sleep duration target is set, there will be Sleep reminder. If there is no response to the first vibration, it will vibrate again 9 minutes later. Press, double click or When you walk 50 steps, the alarm clock will be suspended. The latter is a function not available in similar products, which avoids the embarrassment of getting up early and causing the alarm clock to shake halfway.
Alarm clock effect main What should be valued is the vibration strength and duration. The vibration effect of Charge 2 is discounted because of the "shock absorption" buffer brought by the heart rate sensor, which is far less effective than Xiaomi bracelet and the original Charge. Moreover, the vibration duration of the alarm clock is only 5 or 6 seconds. The author can only use a parallel alarm clock to solve the problem in daily use (usually waking up in the second or third alarm clock).
Step counting and sports encouragement
Daily exercise record
Step number comparison
Step difference comparison
Step accuracy: Fitbit estimation is the manufacturer with the lowest requirement for step accuracy, It is also one of the few smart bracelets that can count steps even when waving. this Probably The anti miscalculation algorithm is set too wide, or the sensor tuning is too sensitive, but the most likely is Fitbit Intentionally... the anti miscalculation algorithm only marked on its official website can prevent being counted when riding, but When the road is too bumpy, it may also be counted. To a large extent, it is convenient for users to slaughter the sports rankings. However, it is a pity that Fitbit does not support exporting to WeChat, Le Power and other platforms in China.
The left hand actually wears Charge 2 and Xiaomi Bracelet 2, and the data statistics for 9 days are shown in the figure above. The data of Xiaomi Bracelet 2 is always the smallest, and Charge 2 is always the largest, with the range almost above 10%. The fewer days of exercise, the greater the difference, even close to 50%, indicating that Charge 2 It is indeed the machine that most often counts irrelevant actions as progress. Besides, a few bracelets Each has its own inappropriate occasions, resulting in The data pattern is not obvious. Again, if you really want to be accurate, your mobile phone is reliable (only when you walk, you will run with your mobile phone, and the number of imaginary marks is much smaller).
Reminder of long sitting: After the monitoring algorithm of the bracelet has the ability of automatic sleep monitoring, the algorithm extends the function of "sitting reminder and automatic motion monitoring". In terms of automatic monitoring, domestic manufacturers such as Xiaomi/Weile/37 degree bracelet/Lexin bracelet even achieved automatic sleep monitoring earlier than big manufacturers such as Fitbit and Samsung. On Fitbit Charge, this function is not supported until the system is updated in early 2015, and the Gear Fit abandoned by Samsung can only be enabled manually until now …
On Fitbit, this automatic motion detection system is called SmartTrack， Fitbit Charge/Flex/One/Zip, these old or low-end products are not equipped. Charge 2's Remind and request for long sitting There are 250 steps of exercise per hour, and the reminder period can be adjusted at will between 9 and 24 o'clock. In the preset period, when I am not exercising enough (10 minutes of inactivity in a row is regarded as static), I will give a vibration reminder at 50 minutes every hour, and the text pushed is "It's time to walk, it's time to walk, take me to exercise, can I walk to XX steps, do you want to take a walk" and so on.
Daily activity hours and automatic motion monitoring
Automatic motion monitoring and exercise mode: For the manual motion monitoring mode of similar products, the type of motion should be selected first in the bracelet or mobile phone before the start of the movement, and then the running should be started. After the completion, it should be manually closed. Ordinary users are too lazy to choose, or forget to turn it off after running, so the function availability is very low.
Charge 2's SmartTrack's The improvement is that whether you are exercising can be calculated according to the exercise mode, duration and heart rate, and even running, cycling, elliptical machine and aerobic exercise can be automatically recognized, Moreover, the recognition duration can also be customized. By default, 15 minutes of continuous exercise triggers the exercise record. Closing some recognition items can save some power).
It's one of the few“ You don't need to wear it. The best thing is that those who need to call GPS for running and cycling are also automatic. Tennis, football, basketball, even dancing can be recognized, but High intensity intermittent sports with extreme arm activities, such as weight lifting, rowing and boxing, will affect the reading and may not recognize the sport.
Exercise and socialize, and compare steps with friends（ The passion of real users is far higher than our Jilao expected)
Respiratory guidance
No matter what kind of exercise, the control of respiration and rhythm is very important. sooner or later, health products must provide respiratory monitoring function. The breath guidance of Charge 2 is the first product of its kind to add this function, but now it basically teaches users to breathe deeply. Deep breathing is a kind of meditation, which can reduce blood pressure and cardiovascular disease risk. It is based on the principle of heart rate variability (HRV) (heart rate increases when inhaling and decreases when exhaling) ， Let the machine perceive whether the user is exhaling or inhaling, Recommend personalized breathing mode according to the change of heart rate, Help users "correct" breathing.
Actual interface Basically, while displaying the breath fluctuation chart, it prompts the length and timing of breathing. The experience is very fresh. The following breath wave chart is about 1 or 2 seconds late. The higher the synchronization rate with the machine's indication, the more Small flash prompt. The official recommendation is to use it in the morning, at noon meetings, before work and before sleep, which can be used to calm the mood and concentrate, But unfortunately, the guidance will not give a score and will not be recorded by the system in the end. Now it is more just a function of tasting new things. The measured effect of concentration is average, but it is better to use it before sleep
Sleep detection
App statistics
Web side data
It is much less difficult for the smart bracelet to make sleep statistics than counting steps: the strategy of Fitbit is that if the user is inactive for more than one hour, sleep will be assumed to start. If there is a small movement for a short time later, it will be judged that the user is sleeping. Rolling and short-term movement during sleep will be recorded as "light sleep", and excessive and prolonged movement will be marked as "wake up". Actual sleep time=total sleep time wake up time. In addition, Charge 2 Common and sensitive modes are provided, The latter greatly improves the sensitivity and is suitable for users with sleep disorders or who hang the machine on their clothes.
The main threshold here is to record the start and summary points of sleep. Fitbit Charge will not be able to automatically monitor sleep time until the middle of 2015, while domestic products have been able to record sleep time more accurately since 2014. Now the sleep time record of the smart bracelet has reached a very high maturity, and the judgment error of almost all products is within 10 minutes.
Sleep duration detection comparison (Xiaomi's data is the sum of deep and shallow sleep time)
The accuracy of the actual sleep time point of Charge 2 is weaker than that of domestic products. Generally, there will be 5-10 minutes of error in the wake up point. The 5 and 6 minutes of staying in bed are often regarded as waking up, resulting in The duration of charge 2 is generally several percentage points longer than that of Xiaomi bracelet 2. However, on the sleep record, the author prefers Charge 2, which directly records the actual sleep duration, rather than the domestic products that separately display the duration of deep and shallow sleep (the sum of the frequent deep and shallow sleep duration of Xiaomi Bracelet 2=the total sleep time difference, which means that one night's sleep is dead, and the data credibility needs to be verified).
All weather heart rate detection
Xiaomi bracelet 2 Charge 2、Apple Watch、ticwatch 2
The most widely used heart rate tracking technology includes chest band and wrist photoelectric sensor. Charge 2 and almost all wearable devices on the market use the latter. The principle is to irradiate the skin with LED and calculate the heart rate from the reflected light changes caused by blood flow. It is required to wear it at the next finger width of the wrist joint. When exercising, move it up to 3 finger width, close to the wrist but not tight.
Charge 2 adopts the technology officially called PurePulse by Fitbit. From the appearance, its biggest feature is its huge size and bulge. The area of the receiver in the middle is more than 10 times larger than that of similar products. The green LEDs on both sides are also large and have a large span. Even if it is not fully fitted to the skin, it can normally read the heart rate data as long as the separation is not too severe. As long as it is not too loose, it will not be unable to read the heart rate during strenuous exercise.
Looking at the size of the frenzied sensor, I thought it would be very sensitive, but its heart rate detection speed is no different from other products. It takes about 30-40 seconds to start displaying the heart rate value. In addition, the buffering intervention of its algorithm is also very obvious. In addition to the degree displayed nearly one minute after taking off the bracelet, when suddenly exercising, its heart rate changes much slower than that of Gear Fit, ticwatch 2 and other products. After the heart rate suddenly soars, the reading of Charge 2 will take about 10 seconds to "slowly" rise. In actual accuracy, the value of Charge 2 is generally 1-3 times lower than that of Xiaomi bracelet 2 and ticwatch 2.
Heart rate detection app
Web side
The advantage of Charge 2 in heart rate sensor is overwhelming power consumption control and interaction. Fitbit and Garmin are the only manufacturers that can keep the bracelet with all-weather heart rate detection and 5-day level endurance. As long as it is worn on the hand, Charge 2 will always detect the heart rate, and the heart rate data will be recorded at 5 minute intervals. The closest product in China can only achieve automatic measurement once every half an hour. A very detailed heart rate curve can be seen from the high and low peaks at a fixed position throughout the day. For users who need to exercise and have heart disease, the function of raising their hands to check the heart rate value and record the daily heart rate change is killer.
In addition to the heart rate value, Fitbit also uses lines to represent the exercise range, so that exercise users can understand the current exercise level. It uses the general algorithm of "extreme heart rate=220 age" to distinguish three intervals of "fat burning, aerobic activity and peak" (corresponding to 50% - 69%, 70-84% and above 85% of the extreme heart rate respectively). Although the reading can be kept during strenuous exercise, the extreme heart rate of the tester on the author's hand is obviously low. After playing basketball for 2 hours, the maximum heart rate did not exceed 136. Of course, it may also be because the reading changes slowly. When the value rises to the actual heartbeat number for tens of seconds, the author stopped because he was too tired to stand, and the extreme value was missed in this time difference
In general, the core of Charge 2 is the all-weather heart rate detection capability, the accuracy and continuous detection in the daily exercise range. However, the instantaneous reading is too low to capture the acute heart rate change, which is a pity.
Endurance Charging and maintenance
Endurance: Fitbit The product of Fitbit Charge 2 will have at least 5 days of endurance. After providing all-weather heart rate detection function, even though Fitbit Charge 2 has many power saving settings such as automatic screen off (wrist facing outside, screen off immediately), automatic heart rate detection stop after taking off 10 seconds or so, its nominal endurance is also pressed on its starting line.
The actual service life is about 5 and a half days. commonly Fully charged at 1:00 a.m., full Bluetooth connection push, two alarm clocks a day, heart rate detection day and night, low battery reminder will appear on the app in the early morning of the fifth day, and low battery reminder will appear on the bracelet at noon of the fifth day (low battery icon will appear after each time you raise your hand to look at the time, but ordinary users will put down their hands after looking at the time, which is very likely to miss the battery reminder), Generally, the machine can not be completely powered off until 9:00 am on the sixth day.
The machine will remind the user to charge the battery all day in advance, so there is no need to remember when to charge the battery, so it will be easier. However, it is worth mentioning here that the Fitbit still has no percentage power indicator today, and the remaining power can only be guessed by looking at the icon
charge: Charge 2 You can use the mobile phone charging head or the computer USB port for charging. The computer USB port 0-100% charging takes about 1 hour and 50 minutes. However, the charging mode is relatively "original", there is no magnetic adsorption, only a simple clamp is fixed, and the scores are positive and negative. It is not as comfortable and easy to use as the normal smart bracelet/watch, and even more troublesome than the plug-in first generation charge.
maintain: Low waterproof level is also a "feature" of Charge series, which has been complained for many years. Charge 2 can only prevent sweat and splash during exercise. It cannot be immersed in water. It is not recommended to wear it for bathing. You can wash it directly when it is dirty, or even use a solvent with a small amount of alcohol to scrub it. Like most bracelets, it does not need special care.
The charge series products will open after 4 or 5 months, In front of the old charge users like the author, the biggest improvement of Charge 2 is the heart rate and replaceable watchband. Maintenance is much easier. If the watchband is worn out, it can be revived in place by replacing it. Users who have used N bracelets said that, including Gear Fit and Microsoft bracelets, any high-end bracelet that cannot be replaced or whose main body is made of fragile plastic material is not recommended (wearing it for more than half a year may make it impossible to wear it out due to its worn appearance).
It is worth noting that the lighter the color is, the brighter the color is, and the more obvious the signs of aging are. The sky blue on our hands is certainly bright, but it will look older than other dark color watchbands after aging for several months. Before buying, we must make a good balance between tight fitting and worry free.
In addition to the late aging problem of the watchband, Charge 2 is relatively durable. The front curved screen is still as new after half a month of use, but the buckle with hard material is a bit aging (dirty), and the watchband has no obvious discoloration. In addition, I have to complain about the soft black plastic cover beside the heart rate sensor, which can be scratched by nails!!! It's unbelievable
summary
For the author, Charge 2 is the only product on the market that can be seen and used for a long time. It has a good shape, all-weather heart rate detection, and fully automatic exercise records. The most important thing is that it can change the watchband;
For old Fitbit users, Charge 2 is a "bucket work" with almost no shortcomings, which also implies that it does not have much new ideas. The software and hardware are of the same standard Heart rate technology has been used in the previous products for a long time, and there is no big change in the appearance and aesthetics of the products. The only thing worth mentioning is the improvement of changing the watchband;
For Garmin Gear Fit 2、 Users of high-end similar products such as Microsoft's bracelet 2, although Charge 2 is certainly not as cool as Fit2 and Microsoft's bracelet with large music screen, it is a more beautiful choice than Garmin's products at the same price. and The only way In terms of sports professional function, Garmin only has Fitbit for anus, and other products remain at their level 1 or 2 years ago;
For users who have only used domestic bracelets, in addition to the obvious differences in product workmanship and design, the experience of Charge 2 is quite another matter. Especially in terms of software, data display and sports encouragement, we can realize the huge gap between the world's first and the followers only when we use them personally. However, all-weather heart rate detection and professional encouragement and advice for sports are not available for fitness and special needs users in domestic products for several years.
However, the problem of server speed and high price of "2 minutes of movement, 2 hours of synchronization", as jokingly called by netizens, are unavoidable pain points of Charge 2. Whether it's worth buying depends on how much you need for heart rate, sleep and exercise advice functions, After all, 898 yuan is already available on Gear Fit 2, Huami Watch and ticwatch.
Follow our Weibo @ Love Computer
Follow our WeChat official account: playphone
Of course, we also pay attention to our Bilibili account: love computer
