I am talking abiut mi band 3.which is extremely good.with great look and design and when you wear it you also feels good.as it have pulse rate, mobile tracker, sleep tracking, and the great is step tracker which tells exectly steps.with OLED display.
It is user friendly as it doesn't harm our body and there is also adjustment for different uses.
It's prices are slightly high as compare to other's company band but its features are very good.
The band can be removed from main system.it design likes a slim watch or band.
Its battery performance is very good as it standbys upto 25 days.