... sync with USB2.0 interface 2,charging fucntion 3,400 mAh backup battery 4,LED light 5,Ultra ... thin design,portable Item #:MP-028Item Name:3 in 1 Ultra Thin Card Battery Features 1, ... data transfer 2,charging fucntion in emergency situation. 400 mAh capacity,which can supplement 15% power capacity ... for iPhone. 3,Allows you to charge your iPod, iPhone, iPad ...