High quality ultra-thin external back clip battery, Extra power For iphone4/4s

After iphone 4/4 s mobile phone test, when back clip battery  in full charge, can actually give iphone 4/4 s of 50% - 60%  electricity! Onetime cannot make iphone full.This back battery for emergency use.

The back clip emergency battery (1900 ma), grind arenaceous antiskid material, and feel good, ultra thin design, it is not only a back case but also a bettery , really convenient ,just meet your demand.

Function parametersCapacity: 1900 mahBattery: lithium polymer batteriesInput: 5.0 v - 500 maOutput: 5.0 v - 500 maSize:  120×62×17.6(mm)

Charging time: 3-5 hours

Weight:65g

About shell color: blue means inside blue  & outside black, green means inside green & outside black,Other colors are the same.