MI Band is one of the commonly used fitbit band. I am not happy with this brand and would counsel you to go for some other global brand which fulfills you essential capacities.
I trust you like my review and this cleared up every one of your questions:
Likes:
Price is good as compare to others.
Water resistant
Vibration alerts for calls and SMSs are great.
Battery reinforcement is better than average
Dislikes:
Lack of display unit.
Quality of product is not that great.
The 3 leds indicator is not performing well.
Issue with the accurate activity and sleep tracking
Service centers are bad.