I have been using Mi Band 2 from 1 month
And I found it very usefull
Very simple to use
All you have to do is download mi fit app
Then you have to connect your band to your phone through bluetooth
Then open this application
This app ask you for weight, height and other stuff related to your health
It looks cool and very stylish in anyones hand
And it work very fine
Helps you to analyse your sleep
Measure your foot step, heart rate, distance
And this band also notify you for your messages and calls and many other apps too
Its battery life is good
And its totally worth for buying it in range of 1999 .