Mi products are always worth. But Here’s a new band launched by Mi that is Mi Band 4. Which have lots of features in it. Firstly it’s different from Mi Band 3 . It have an colourful OLED display which make looks good. It’s screen is flat there is no depression in screen like MI Band 3. Which is good for me. You can control music also from this. You can set your wallpaper too . And some new features were added . Like timer and alarm . It’s display quality is not good as like Mi Band 3. However it’s heart rate monitor doesn’t works well. When I put it on the air it shows reading . It shows wrong heart rate reading .Overall all features are good . And it’s Battery life is quite low. which is okay.