1.rechargeable backup battery charger for psp,mp3,mp4,phones 2.charger for phones,pda,mp3,mp4,game 3.li polymer battery Its capacity reach to ... . Unit adopt usb output and have double function of charger and backup battery.You can charge your device such as mobile phone ... product have passed strick test and have one year warrant rechargeable backup battery charger for psp,mp3,mp4,phones