Test – Xiaomi Mi Smart Band 4: a Really Smarter Bracelet?

The Xiaomi Mi Smart Band 4 does not really play the originality card since it partly takes up the design of its predecessor, the Mi Band 3. It’s not necessarily bad news, we’ll see below.

Xiaomi’s new connected wristband has a 39.9% larger display area. This 0.95-inch screen supports AMOLED technology and displays colour content for the first time. On the back, two green LEDs are integrated and help calculate the heart rate. The silicone bracelet has 12 holes. It can still be detached from the dial.

Inside the bug is an accelerometer, a heart rate monitor and a gyroscope, but no GPS. The whole weighs 22 grams and has dimensions of 46.9 x 17.9 x 12 mm. In addition, the Xiaomi Mi Smart Band 4 is waterproof up to 5 ATM.


An Update on Competition

Hard to find credible competition at this price against the Xiaomi Mi Smart Band 4. Adding a few euros, the Huawei Band 3 Pro is a solid alternative that integrates a color OLED display a heart rate monitor and a GPS. We can also talk about the Mi Band 3 which is still an excellent connected bracelet even if less sophisticated.


A cleaner design

In designing her Mi Smart Band 4, Xiaomi has followed the Mi Band 3 recipe almost to the letter. Moreover, their bracelets are also compatible with this new generation. So we have a domed oval capsule on the back that grafts onto the silicone bracelet. It will still require a little bit of force to insert or remove it.


What really changes on this model is the single button on the front. Always tactile, this physical control is integrated differently in the dial.


Just like the Mi Band 3, the Xiaomi Mi Smart Band 4 is one of the most comfortable connected bracelets to wear. Its lightness is a real plus and it is perfectly resistant to humidity. 

Heading for colour

The Xiaomi Mi Smart Band 4 includes for the first time a colour OLED display. The connected bracelet of the Chinese brand also offers a larger display surface, good responsiveness and excellent readability even in direct sunlight.


To navigate in the interface, you just have to make vertical slides. You will find all the data collected by the device (number of steps taken, number of calories burned, heart rate, weather, etc.). If you slid to the left or right, you’ll be able to control the music being played by your smartphone from Deezer or Spotify. To go back, simply touch the button on the Mi Smart Band 4. Simple and effective. The good news is that you can wake up the screen again by moving your wrist and it is possible to change its theme from the Mi Fit application. The interface of the Xiaomi Mi Smart Band 4 is not perfect either. When receiving messages for example, the text is truncated just like the smileys.


An application that does the job

The Mi Fit application has gone through the lifting box. Always as complete as ever, it displays a clear and well thought-out interface. By providing the most important data collected by the connected bracelet from the outset, as well as complete reports, it avoids additional steps that can be problematic when accessing information in the middle of a workout.

From this application, you will also be able to launch several sports activities with walking, running and cycling on the menu. You can also define an activity target (number of steps) or a weight target. The Xiaomi Mi Smart Band 4 will warn you if you are inactive for more than one hour provided you activate the option in the menu dedicated exclusively to the bracelet.

This allows you to set up the synchronization between your bracelet and your smartphone. It is from this menu that you will be able to activate or deactivate the alarms or alerts issued on the Mi Smart Band 4 by your phone upon receipt of a call, message or notification on an application by application basis. Choosing the heart rate detection method is also done from this page. By going through the display settings, you can rearrange or delete items appearing on the bracelet. Finally, by activating the night mode, the screen brightness will be lower and it will no longer light up when you move your wrist.


Analyses that lack precision

The Xiaomi Mi Smart Band 4 is based on a total of three sensors: an accelerometer, a heart rate monitor and a gyroscope. If you do not indicate on the bracelet the nature of the sports activity you are going to practice, the bracelet will not be able to follow you. Moreover, the Xiaomi Mi Smart Band 4 still doesn’t have GPS on board. It’s a pity, but at 40 euros, he’s already doing a lot.


The Mi Smart Band 4 is doing pretty well as long as we’re walking. When it speeds up, he has a hard time keeping up. Her sleep analysis does not compensate, as it is just as flawed and struggles to mark the times when we are awake. If Xiaomi’s bracelet is not an ace of precision, it remains a very accessible product capable of producing correct balances.



An autonomy of thunder

This is clearly one of the great strengths of this new generation. It was only after 20 days of intensive use that the battery of the Xiaomi Mi Smart Band 4 fell flat. So it does better than the Xiaomi Mi Band 3 even though it has a color OLED screen. To recharge its 135 mAh battery, it takes 1h45.



Xiaomi continues to impress us by offering this year a smarter wristband packed with features and quality at a great price The Mi Smart Band 4 is not the most accurate activity tracker but its analysis is still good to take. If you want much more advanced evaluations, you will have to add a few more euros to get the Huawei Band 3 Pro which also includes a GPS.

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