In recent years, with the development of smart phones, smart wearable devices have been gradually integrated into our lives. Among smart watches, bracelets, glasses, clothing and other smart wearable devices, the most affordable and functional one should be smart bracelets. Nowadays, there are many kinds of smart bracelets, which can meet the common functions of recording movement, heart rate sleep monitoring, and information reminding. Since there is little difference in function and appearance, more attention is paid to the recording and detection accuracy of the bracelet.

This smart bracelet introduced by the author is the CoBand K4 smart bracelet of Demon Lover, which is a new product of Demon Lover in 2017. The CoBand K4 bracelet returns to the simple line design this time, so that its function and appreciation are integrated. Now let's ask the author to introduce how this bracelet is suitable for everyone.

Open the packaging box of CoBand K4, the way of inlaying inside is more prominent is the body of the bracelet, and the body protection measures are in place.

Take out the bracelet body, and the bottom is the watch strap, charger and instructions. The natural bending degree of the watch strap is relatively close to the wrist.

The body adopts an oval design, 0.86 "OLED large display screen, and supports the display of incoming calls and SMS numbers, QQ、 WeChat and other messages can be viewed at any time, so that various data and information can be displayed more comprehensively. Now the bracelets are equipped with small dots to facilitate the switching of various data. What is more different is that long press the small dots can select to switch on and off the device, so that it can choose to turn off the device when not in use to protect the power. Avoid frequent charging. This design is the first time to see, and the effect is remarkable. The careful team also pasted a protective film on the screen to better protect the screen from scratches. Hard plastic material is particularly prominent in the sun.

The heart rate sensor on the back side of the fuselage supports dynamic heart rate. With it, we can measure heart rate anytime and anywhere. Take better care of your sports health.

There are two contacts on the side of the radian fuselage. With the strap on, this design can better protect the contacts from water ingress or corrosion, affecting the charging. Charge in combination with the charging line.

When you press the dot for the first time, if you cannot start the machine, it may be that the bracelet is out of power, not that the bracelet is broken. You need to charge it before starting the machine. It takes about one hour for a 50mAh battery. Normal use for about 10 days, and simple standby for 50 days. The first time I used this charging method, the screen automatically lights up when charging starts, and the battery exclamation mark and battery icon automatically switch when the battery power is displayed. I mistakenly thought that the contact was poor, and felt that adding some magnetic suction was more convenient to operate. The charging mode is optional (power bank, computer, etc.).

Demon Lover CoBand K4 smart bracelet watchband has five colors: black, blue, yellow, orange and white. This time, the author got a black watchband, which is made of TPU skin friendly material to avoid the occurrence of watchband allergy. It is sweat resistant, wear-resistant and dirt resistant, and has better flexibility than ordinary watchbands. The surface is matte and not shiny. It doesn't feel very soft and has a little friction. This watch buckle is very well designed, which is not convenient for the strap to run around and fall off easily. The whole machine weighs 17.7g, so there is no sense of weight when wearing it, and you may even forget it.

It is not difficult to see that the heart rate detector is slightly higher when it is mounted on the rear side of the fuselage, so that it can be closer to the skin and measure more accurate data.

I have to say that the international route of the bracelet is very visible. It supports the push of Chinese and English subtitles of QQ, WeChat and other messages. Heart rate, steps, and fat burning are basically signs of English abbreviations. Compared with the display on the large screen, the font can be shrunk. The layout is not very good. The brightness is OK in the sun. Of course, these are relatively normal pages. What the author doesn't understand is the following one.

The vertical screen will be disordered and irregular. In some cases, the kilometer number will be displayed half way up and half down. This will happen when the step number reaches four digits. This phenomenon will be eliminated when the horizontal screen is displayed. Does the author walk too fast and throw away all the figures.

At the beginning, the author used the Wizards CoBand K4 smart bracelet tested by Apple 6s. The first time when the device was powered on, the screen was horizontal by default. After the latest version of the app was upgraded, there was no horizontal or vertical screen adjustment. The author tested it with an Android phone. After adjusting it back to the horizontal screen, it will automatically adjust to the horizontal screen according to the mood. As its owner, you can't control it.

Scan the QR code on the instruction manual to download the app, open the app and you can see the kilometers, calories, steps, sleep quality, heart rate and weight of exercise intuitively. It is very convenient to see the main page. If you want to observe more carefully, you can view the details and record your movement information at every moment. Kilometers, calories, steps, sleep, heart rate and other data are stored for up to one month. Users can analyze their health status for nearly a month.

The plus key is a quick way to find your bracelet, take photos and share your health. After Bluetooth is connected to the device, the remaining power can be observed and the movement information can be synchronized in time. Of course, sports should have its own sports circle. Through APP, you can add friends and send text, voice and pictures to each other.

Enter into the setting page, and you can set the call, SMS, alarm clock and heart rate reminder, Do Not Disturb mode, wrist lift and bright screen, 24-hour format, horizontal and vertical screen, screen out time and intelligent loss prevention for ring exchange. Restoring factory settings and modifying the name of the bracelet are not available in other bracelets. Unbinding the bracelet can facilitate users to change mobile phones. Raising your hand to light the screen is very sensitive. Heart rate detection can set the time period and maximum heart rate, and there will be a vibration warning after exceeding. The actual test will vibrate regardless of the heart rate.

I can also see my heart rate test table. I really feel that the measurement is too unstable. When I was just 25 years old, my heart rate often soared to 154. The small heart still can't stand it. The quality of sleep is relatively accurate. I may have sleepwalked three times when I was awake, but I don't have this memory. The weight is OK, but I thought it was filled in manually by the author, which is more accurate.

Summary:

The product of Demon Lover is relatively trusted by the author, who has produced a relatively mature and stable smart watch and bracelet. However, as far as the shortcomings of CoBand K4 smart bracelet are concerned, the hardware is worth affirming, but a slight modification should be a perfect product. Because in the process of use, the author can also see the good intentions of the Demon Lover team for the CoBand K4 smart bracelet, and also see the difference from other bracelets. When it is released, every user can better manage their own sports and health.

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