power bank Capacity:4000MAH Battery cell:polymer For:ipad,iphone,MP4/MP3,PDA PSP MID,mobile phone etc. Product: Power bank Specificationspower bank Capacity:4000MAH Battery cell:polymer For:ipad,iphone,MP4/MP3,PDA PSP MID,mobile phone etc. Product: Power bank Specification: 1, Dual USB output2,High Efficiency of power conversion(90%) 3, Four LED indication light4,Powerful with long using time 5, ...