First of all, I would like to thank the computer pilot and the Demon Lover for giving them a chance to try.

In 2017, the wear market was still so hot that many fashion trendsetters wanted to look for their favorite bracelets, just like choosing their lovers. Their appearance, ability and even feel were all indispensable, because wearing a beautiful bracelet not only makes people happy, but also is a careful health secretary. It can do many things that mobile phones can't do, such as:

1. Information reminder. Many girls like to put their mobile phones in their bags, so they are in noisy places, QQ、 WeChat messages and even the ringing tone of the phone can not be heard, so you can know all kinds of information at any time with the bracelet;

2. Sleep monitoring. There are many people whose sleep quality is not good enough. Insomnia or dreaminess are common among urban people. Correct understanding of their sleep time plays an important role in mastering their own health.

3. Decoration effect. The bracelet is becoming more and more exquisite. It feels like a high-tech style.

4. Health and exercise monitoring. This function is very useful for people who often keep fit and need to lose weight. It can accurately count steps, calorie consumption, fitness planning, etc., and some workers can use a regular alarm clock to remind them of exercise.

There are many kinds of bracelets on the market, and the homogenization is also serious. How to select a desired product is also a problem. If you also want such a "health secretary", let's take a look at this "Demon Lover CoBand K4 smart bracelet" that the author got, and first look at the parameters:

1、 Unpacking

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The packaging box of Demon Lover CoBand K4 uses environment-friendly materials. In addition to its strong and durable materials, it is also simple and generous in design. There is only "Smart band" in English on the front, but the product name and information are marked on the sticker at the bottom of the box. This design method is more in line with the distribution of e-commerce channels, which can not only save costs but also increase the "foreign style" of products.

The author used one foot of his 78kg weight to exert force, and stepped on it forcefully. There was no sign of deformation in the packing box. Ouch, it was good.

Open the box type package of heaven and earth, and you can see the host of the CoBand K4 smart bracelet of the Demon Lover. The oval design is very round on the whole, and the front is like a 2.5D curved surface process of the mobile phone screen, making the middle stand out.

The 0.86-inch oval display screen that CoBand K4 added this time can see more content under the large screen, as well as surprising subtitles; CoBand K4 has added a new display mode. The horizontal and vertical screens can be switched freely in the APP, which not only takes care of the use habits of old users, but also gives new users more choices and is very easy to use.

The white circle at the bottom of the screen is the operation function key. You can switch between different functions by touching it. In addition, long press for 3 seconds is to turn on/off the machine. There is a vibration prompt.

Only one heart rate sensing detection area on the back is slightly higher than the back plane. When we take off the bracelet, we often see it emit green light.

The host and wrist strap are separate and independent, which is the same as the design of many bracelets. One side is a rechargeable metal contact, the main body weight is only 4.2g, and the battery capacity is 40mA. On JD's sales page, we can see that there are many colors of wristbands: dark black, vitality orange, lemon yellow, sky blue, cherry blossom powder, and piano white. All the colors of "clothes" you want to wear for the "little secretary" can meet your needs. The wristband in this evaluation is sky blue.

The wrist strap is still made of TPU material with skin like treatment. It is soft and comfortable to wear on the wrist. The design of the clasp makes the bracelet not easy to fall off. If you put the host into the wrist strap, it will be the complete body of the Demon Lover K4. The sky blue is a bright color, so it will be dirty after wearing it for a long time. But it doesn't matter. The waterproof grade of CoBand K4 is IP65. It's easy to wash and take care of, but don't let it "swim".

It was washed under the tap for 3 minutes, and there was no problem at all. It seems that there is no need to worry about blisters during normal washing and bathing.

In addition, the Demon Lover CoBand K4 has a special charging cable, which can be charged on any USB interface and is very convenient.

Now let's have a family photo. The manual is in both Chinese and English, which ensures that consumers at home and abroad can understand the operation mode.

The CoBand K4 smart bracelet of Demon Lover supports "raising the wrist to light up the screen". The screen will light up when the wrist is slightly rotated. This is the tide flu that is not available to people wearing ordinary watches.  

In the ordinary sunlight, the information on the screen is still clearly visible, and the highlight screen has advantages over many other brands of bracelets.

The screen displays the Bluetooth connection status, time, date and power, and can also receive calls, SMS QQ、 WeChat and APP notifications can be displayed on this screen, so you don't have to lower your head to pick up your phone every time.

Among various functions, the author's favorite is the "sitting reminder" function, because the author is a designer, who sits in front of the computer for a day without physical exercise. With the "sitting reminder" function, I can detect the passage of time. For example, if you sit for an hour without getting up, the bracelet will vibrate to remind you to get up and exercise. When you vibrate four times in the afternoon, I realized that I was going to leave work, and praised it.

By clicking the circle on the screen, you can see the number of steps, distance, calorie consumption and heart rate. The switch is smooth, fast and free of jamming. You can also set the time of the rest screen in the APP to truly master various body data.

2、 Demon Lover APP

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The QR code on the scanning manual can be downloaded from the Amorphous App, which can be used to interact with the bracelet. It supports both Android and IOS systems. The software design is concise and clear, and the classification is clear, but I think there is still room for progress. The APP is mainly divided into two parts: the main page and the side page. The side page can set the user's information, set goals and view the ranking list.

In the ranking list, you can view your own sports ranking. In addition to the total amount of exercise, you can also see the sports performance of other partners. Wow! Some people are so awesome. It seems that I need to exercise more to lose weight and unlock more achievements. Otherwise, I will be a "preliminary messenger".

On the main page, we can directly see the exercise, calories burned, sleep quality, heart rate and weight. The heart rate is a bit wrong. The normal heart rate is the number of beats per minute of the heart. The normal range is 60-100 beats per minute. Below 60 beats per minute is called bradycardia, and above 100 beats per minute is called electric tachycardia. The author once measured 143 beats of the heart rate. Well, maybe I accidentally saw a beautiful woman~~

In the APP, you can set your own small goals, including steps, sleep time, and weight setting. Then, the "little secretary" of the Demon Lover CoBand K4 will report on the completion of daily tasks.

Every time you use the bracelet to connect to the APP, you can operate the bracelet in more detail. There are alarm clock, call reminder, APP notification, horizontal and vertical screen switching and other functions. If you often forget to bring something, you must turn on the intelligent anti loss function.

See here, you will think that the functions of the bracelet are all over. Don't be busy. There are also interesting things in the Demon Lover App.

Is it strange that there is a strange "+" sign on the main page? When we click, we will find that there are three functional options: sharing, looking for the bracelet and taking a photo. What should we do if the bracelet can't be found? Just click the "looking for the bracelet" option, and the hidden bracelet will start to vibrate, making it easy for you to find it It is also a good function to take a picture. When you need to take a picture of yourself in a certain scene, this function can replace the regular photo taking function of the mobile phone, and it is easier to grasp the photo taking time.

[Conclusion]

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The endurance of Demon Lover K4 is very good. According to the official data, it can be used normally for about 10 days, which is the same as the experience of the author. Although there are too many similarities with most bracelets in appearance, the horizontal and vertical screen display, intelligent loss prevention, shake and roll photography, and long sitting reminder functions are really very intimate functions. There are still some inaccuracies in the monitoring data, but this is the common problem of most bracelets. After all, there are different situations in different environments and different use methods. Slight errors are completely acceptable. In addition, the price is really very advantageous and exciting. I hope the manufacturer can constantly improve the firmware and APP, Let the Demon Lover K4 become a more perfect "health secretary".
advantage:
1. Very good battery life, long standby time, the author spent 9 days charging.
2. The large screen displays clearly and has good visibility in the sun.
3. Color wristbands can meet the needs of different people.

4. The monitoring data is relatively accurate, and it is competitive and entertaining to praise each other with friends.

Disadvantages:
1. It would be more convenient if the charging could be changed to a universal data line interface.
2. It is difficult for some mobile phones to connect the bracelet for the first time, and it can only be successful after several times

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