[Preface]

The simple design of the iPhone product in those years was dazzling. In a society where the appearance party is growing rapidly, whether it is a mobile phone or a TV set, good looks are the most important. A product with simple appearance, fashion and powerful functions is the darling of the current smart market. As a wearable smart product, the smart bracelet first injects health attributes. Let's see how the CoBand K4 smart bracelet of Demon Lover is really smart, healthy and environmentally friendly.

Packaging

More and more products are packaged with environment-friendly paper: kraft paper boxes, which are simple without complex processes.

Inside is EVA material slot fixed bracelet host, and the package contains wrist strap, charging line and instructions.

[Product Picture Appreciation]

The bracelet host is small and adopts a black plexiglass panel. The upper part displays blue information and the lower part is a touch button.

The back of the bracelet host is a detection port, and there is a charging contact point at the bottom. The charging metal points corresponding to the charging accessories.

[Wearing comfort]

Comfort is relatively objective, there are not too many standards to measure it. Personally, I think it's convenient to wear the bracelet, and I can't feel the bracelet after wearing it, which is a good comfort experience. CoBand K4 weighs about 7g, and the skin friendly plastic wrist strap can reach the level of basically no sense of wear.

[Horizontal screen switching]

It's up to you to switch freely. Horizontal and vertical screen switching is a good experience for small functions.

[Power endurance]

The endurance of the CoBand K4 has yet to be assessed for a long time. After receiving the goods, it will take about 2-3 hours for the first charge, indicating full point. Frequently use and test various functions, and 34% of the power remains after 2-3 hours. Normal use at ordinary times, power endurance 3-4 days, power endurance is weak.

[Measuring heart rate]

The heart rate measurement method of CoBand K4 adopts the photoelectric projection measurement method. The inner side of the bracelet is close to the skin and emits green light. The functional reflected light measures the blood flow frequency to calculate the heart rate. Most bracelets use this measurement method, but the heart rate measurement error is relatively large due to the environment, human posture when wearing tightness measurement and other factors.

Even if the healthy attribute of heart rate value is obtained, the eggs will be merged. I don't know whether my heart rate reflects my problem, whether it is the heartbeat of my first lover or the mood of hearing the square dance music. There are only numerical values, but lack of health judgment and information based on numerical values.

[Sleep monitoring]

CoBand K4 also has the common sleep monitoring function of the market bracelet. I kept complaining again. The first test recorded that I often slept for 7 hours and 45 minutes, slept for 1 hour and 30 minutes, woke up for 4 hours and 15 minutes, and woke up for 7 times, with poor sleep quality. I was awake for 1 hour and 45 minutes, which made me think I was sleepwalking. I opened a camera to compare the records of the second night and found that the sleep monitoring records were not accurate. Turning and other movements are recorded as being awake. The more times you turn, the more time you record being awake. Similarly, according to my "bad" sleep habits, I did not extend my advice to health consultants. I still turn over several times every night to "wake up".

[Step counting function]

The step counting function is the most prominent part of the data display of the bracelet APP. It can be seen that this is the most prominent main function of CoBand K4. Through the comparison of five mouth counts and bracelet records under normal walking and jogging, the average step error is 5-8 steps within 100 steps. This error rate is acceptable.

[Smart Reminder]

CoBand K4 intelligent reminder functions include long sitting reminder, alarm clock, call, SMS QQ、 WeChat and APP notifications. Basically meet all requirements.

[Intelligent loss prevention]

This is a considerate design. It can solve the problem that people who have lost three or four things can forget the bracelet when they take their mobile phones.

[Apple Health]

It can exchange the monitored data to the health application of Apple iPhone. However, the health test items and data listed in the iPhone are extremely rich, far from being all provided by CoBand K4. Only step distance statistics, sleep monitoring and self entered personal health data are included.

Other Functions

Shake a picture and set up your mobile phone. Swinging the bracelet towards the lens can remotely control and press the shutter.

Finding bracelets is also a very intimate functional design. Click on the APP to find the bracelet. The bracelet will vibrate and help you find it in a short time.

Share, you can share your own sports data or sleep monitoring data to Weibo, WeChat, QQ, etc. through your mobile phone.

[Evaluation Summary]

The CoBand K4 should be positioned as a smart bracelet at the middle and low end. It has many functions, but details such as electric endurance and product design need to be improved.

advantage:

1. The wearing comfort is basically no sense of wearing, and the wrist will not be reminded of being constrained at all times.

2. It has complete functions. All kinds of bracelets have basic functions, as well as several small intimate functions.

3. The black screen displays blue, which is my favorite color combination. Bright, conspicuous and intelligent.

Defects:

1. It is inconvenient to wear the buckle, but it is not easy to fall off.

2. The power life is not satisfactory, and it is charged once every 2-3 days in daily use.

3. There are a lot of data recorded, but they are not identical. It is suggested to analyze the health status and suggest exercise programs according to the measured data.

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