The bracelet has gradually come into everyone's view in this era of advanced intelligence and communication, and has been known and recognized by everyone. It is not only easy to carry, but also has many functions. It can test heart rate, movement, intelligent reminder, air detection, etc., and can be synchronized to mobile phones in real time. For these reasons, the smart bracelet is also constantly improving its own performance, To meet the needs of everyone, from the simple small functions at the very beginning to the touch screen and new products with various functions, today the author introduces a "Demon Lover CoBand K4 smart bracelet".

Unpacking

The CoBand K4 packaging box is simple and elegant in design. It uses classic brown kraft paper boxes, which are full of texture. On the upper left corner of the front of the outer package is a special logo for machine trial, and on the bottom is an English logo Smart Band printed with a smart bracelet;

On the back of the box is the Chinese and English introduction of this Demon Lover CoBand K4;

Equipment type: intelligent heart rate exercise bracelet

Display screen: 0.86 "OLED

Battery capacity: 50mAh

Electronic type: polymer

Input type: DC-5.0V

Input current: 50MA (Max)

Including: host, TPU wrist strap, charging line box and instructions

The packing box of this bracelet is inlaid, and each link that needs to be taken out and put in has a notch design, which is convenient and practical;

Open the packaging box CoBand K4 and embed it in the stable decorations inside the packaging box, just like a bright star in the starry sky;

The overall appearance of the bracelet adopts a racetrack design, and the 2.5D cutting process is adopted, which can effectively avoid collision during use, resulting in the breakage of the bracelet screen; The design of this bracelet does not adopt the full touch design. There is only one concentric circle on the bracelet, which is a control key used to switch functions. The overall screen is high in the middle and low on both sides, which is one of the design highlights of this bracelet;

The side of the bracelet has a groove design, which is also used to fix the bracelet and wrist strap;

There are two metal contact points under the bracelet, and the hidden design also effectively prevents sweat from corroding the contact points;

There is a heart rate sensor on the back of the host. If it is removed and no longer worn, it will give out a green indicator light, and there is also a heart rate sign on the back;

The CoBand K4 wristband is made of medical grade TPU material, which conforms to the ergonomic design concept. The curved bottom is close to the skin, and the inner layer of the skin is smooth, making it more comfortable to wear, The wrist strap has 9 holes reserved, enough to meet the needs of most people;

The clasp of CoBand K4 bracelet adopts metal needle clasp, which can increase the firm clasp with the wrist strap, and is not easy to fall off;

The inner side of the wrist strap has a grooved design designed to protect the charging contact of the host, which can prevent the corrosion of the metal contact;

Finally, the accessories of CoBand K4 are only the charging line and instructions. The instructions are in both Chinese and English, and the charger is a special charger for the host;

Finally, a family photo;

Mobile APP

Scan the APP QR code on the product manual to download the mobile phone APP and install it;

After successful installation, you need to register an account first to enter the login interface. After successful registration, you can log in to the mobile APP;

After successful login, you need to set personal information, including height, weight and other information;

After the setting is successful, the APP prompts to open Bluetooth. After confirmation, you can enter the APP interface. Click the bracelet icon in the upper right corner to pair and connect (prompting the IOS system not to manually select the device, and the Android system needs to manually confirm the device model); After the connection is successful, the user name, power, connected, synchronized data, intelligent reminder, intelligent loss prevention, Apple Health, modifying the name of the bracelet, using the 24-hour format, checking and updating firmware and other information will be displayed (only three alarm reminders can be set at most, slightly less);

Back in the main interface, I found that the APP data statistics of this bracelet included three items: sleep, heart rate (there would be a beep when using the APP to measure), and weight;

There are five submenus in the main menu, including achievement card, ranking list, my goal, settings, and feedback;

When using the Android system for testing, the author found that the features of the previous version are more comprehensive and stable than the previous version. When using the IOS system for testing, the author found that he would often be disconnected, and the firmware upgrade could not be completed. During the testing, the author also found that this Demon Lover bracelet is not applicable to all mobile phones, and some models would not be able to connect to the device, Moreover, the bracelet is very expensive, and one shake will consume a lot of power. I hope this problem can be improved when upgrading the new version of the firmware. After all, the powerful standby is also a highlight of this bracelet. But the design of the bracelet and wrist strap is really unreasonable, which is likely to cause the loss of the main device of the bracelet. It is recommended that this method not be used in future products.

Suggestion: It is suggested to add some functions in the later development of mobile APP, including sports function, sports pattern recognition, weather test, air quality test, SOS function, etc.

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