Mi Smart Band 4 Full Review In 2021-Should I Buy It?

The Mi Band Xiaomi is always the first to come to mind when it comes to smart band value for money. The latest version, branded as the Mi Band 4, maintains the brand’s well-known recipe by retaining the style of the previous generation, offering a competitive price, and adding new features. Here’s what the Mi Band 4 smartwatch or fitness tracker will do when it’s attached to your hand!

Mi Smart Band 4 Design:

In terms of design, Xiaomi has not made any major innovations compared to the previous model. The Mi Band 4 is a simple bracelet, from the Mi Band 2, the black 18mm rubber band and body of the tracker, the brain you communicate with. The body of the fitness tracker is similar to that of the Mi Band 3, meaning that the two generations of strips are interchangeable.

Be sure to adjust the strap and press the button to prevent it from slipping. It happened to me during the night during the first days I used it. I like the strap on the Honor Band 5 because it is more rigid and lightweight to fit different sized wrists, while the Mi Band 4 is undoubtedly narrower and more discreet.

The Mi Band 4 comes with a light (22.1 gram) smart band, water-resistant to 5ATM, and a 0.95-inch AMOLED touchscreen display with a resolution of 120×240 pixels. The screen is protected by 2.5D tempered glass, which does not attract fingerprints, thanks to its coating. Compared to the Mi Band 3, you get a larger screen and, above all, a color display.

It provides a maximum brightness of 400 nits. Under direct sunlight, you will have no problem reading the show. This is perfect for those who do outdoor sports. Navigation is done through the touchscreen and small circular capacitive keys at the bottom of the display.

Xiaomi allows you to customize the dial with the Mi Fit app. In the section dedicated to performance, you can choose from fifty different themes, which, once selected, will automatically sync with the smart band‌.

At the bottom of the fitness tracker are hidden sensors including the Mi Band 4: 3-axis accelerometer, 3-axis gyroscope, heart rate sensor PPG and capacitive proximity sensor. Mi Band 4 supports Bluetooth 5.

Mi Smart Band 4 Price:

The Xiaomi smart band costs £35, and it can be purchased both in Mi Stores and online in the UK. This is a much less expensive alternative to Fitbit and Garmin fitness trackers, but it costs marginally more (five quid to be exact) than Honor Band 5.

The black bracelet, the instruction manual, and the charging base are all included in the pack. If you want more colorful straps, you can get them for about £10 to £14 on the internet.

Mi Smart Band 4 Battery:

The Xiaomi Mi Band 4 has a 135mAh battery that can last up to 20 days on a single charge. I can’t confirm or deny this information at this time because I’ve only had the Mi Band 4 for a week, but it shouldn’t be an issue because I still have 70% battery life.

You’ll need to use the dedicated base to charge the Mi Band 4. Since the cable is so small, you’ll have to charge it by sticking it on a flat surface, so it’ll dangle if you use a wall socket.


The Xiaomi Mi Band 4 accomplishes the tasks for which it was created and comes with a good set of features. Customization, both on the hardware and software level, is one of its high points. As previously said, data on sleep, heart rate, and physical activity tracking is approximate and can only be used as a guide; it cannot substitute advanced equipment or a real doctor. As a result, the Mi Band 4 is ideal for those who want to monitor their physical activities in a fun way.

The delivered quality-to-price ratio is once again excellent, though Xiaomi is no longer the only company on the market to sell a compelling fitness band at a comparable price. If you’re searching for an inexpensive and reliable smart band, the Mi Band 4 would suffice; but, before you purchase it, consider the Honor Band 5 – it’s marginally less expensive and comes with integrated training schedules.