The below image seems to show that the Xiaomi Mi Band 4 will have a 0.95-inch full colour OLED display, with a tempered glass cover rather than plastic. This is a big improvement from the monochrome display of previous devices in the range, and should make it far more attractive to use - but we...

The Xiaomi Mi Band 4 now sports a 0.95-inch display with 120×240 pixels resolution. It also sports a 135mAh battery along with a similar 20-day battery backup claim. For connectivity, Xiaomi has added Bluetooth 5 in the new version of the fitness band.

At $40, should you buy the Xiaomi Mi Band 4 or pay double that for a comparable device from a competitor...

Low price point Accurate fitness; health; and sleep tracking Connected GPS is a big plus 20-day battery life Plenty of smart features and customization options

Mi Fit app won't be everyone's first fitness app choice Heart rate sensor struggles with high-intensity workouts

Coming in at half the price of the cheapest Fitbit, Xiaomi's latest Mi Smart Band 4 offers activity-, health- and sleep-tracking at an incredible £34.99. The enhanced colour AMOLED panel alone makes it worth the upgrade, though it won't entirely replace a smartwatch or smartphone for notifications,...

The Xiaomi Mi Band 4 delivers fantastic value and features. Upgrades over its predecessor include a color OLED display with significantly improved outdoor viewability and a higher resolution too.

Very cheap; Slimline design; Heart rate monitor

No GPS; No multitasking apps; Doesn't auto-stop tracking

If you're in the market for a fitness tracker, you're more than likely hoping to modify your health behavior - whether it's remembering to walk more, tracking how often you work out, or making sure you're working out appropriately hard when you do.

14-day battery life; Bright; colorful screen; Feature-packed at rock-bottom price

Limited types of exercises tracked; Sleep tracking is not very accurate; Mi Fit app provides few actionable bits of advice

In the world of activity trackers, nothing comes close to the Mi Band's value. Cheaper than any Garmin or Fitbit tracker, even the most basic vivofit4 and Inspire , but still packing enough functionality, it also benefits from Xiaomi's name recognition and is considered a serious choice, not a cheap...

Price $30-40 is cheap for what you get; Extremely cheap, Display It's bright, visible outdoors, beautiful, and doesn't affect battery life much, Battery life Even with auto-wake and heart rate measures every 30 minutes, plus some walks and swims, I can get about 10 days on a single charge, Google...

Interface It's not as customizable as I'd like; You can't reorder or hide exercise types, or remove unnecessary items from the More menu, Android app Clunky and shows ads; It's sad that you get ads even after having purchased the band, Swim tracking Worked well for the first two swims, then became...

Xiaomi has made a great contribution to the development of wearable technologies. Its fitness bracelet Mi Band is the most popular wearable device in the world. Most likely, you or a friend of yours have a smart band from Xiaomi .

To sum up, the one thing I didn't like about this band is its design. It's gotten stale with the same design language repeating itself since the very first generation.

Xiaomi's Mi band 3 launched in May 2018 to become one of the most popular fitness tracking wearables in India. This added up to the already mass-selling range of Xiaomi's wearables, comprising the Mi Band, the Mi Band 2, the Mi Band HRX edition and the Mi Band 3.