I buy this Band from Mi. com to connect with my Mi Note 4 smart phone. first few weeks I found nothing problems with this Band but after two months some of the functions are not work properly, some times in a day it hang and touch screen can’t respond properly. This is the biggest problem with the mi band. I also don’t like the look of the band because it is not so slim like others Company band. I found another big problem with this band is the battery, when the band was new I charged it in night and used whole the day but after two months the battery backup was reduced so sometimes band Battery reduced to Zero twice or more in a day. So I prefer my friends and family not to buy this band. I totally wasted my money.