... with amazing control 2,smartphone backup battery 3,portable emergency charger box Power case with Amazing RemoteIt is ... innovate accessories for Apple iphone4/4s, external power case box ,backup battery,will be your good partner for ... no worry about the smartphone is out of power.1) Polymer Lithium Ion Battery core,standard ... 20°C~65°C for iphone4/4s power case backup battery with amazing control