Since I am using this band from last 3 months. And I tell about my last three month experience with this smart band. Firstly I tell you that it hard to see anything in the screen when I was in sunny outdoor.So it is a big problem for me. The second problem I faced is that due to silcone band more sweat come between band and my wrist so I have to clean it multiple times during my workout . Battery backup is good enough. Some features work not properly somtime like it shows wrong blood pressure and the step count was many times wrong. So I suggest not buy this smartband.