... 4s/ ipad/ mobile phone, Dual USB Ports external Power Battery Pack SpecificationsCell type : Li-polymer batteryCapacity: 6600mAh/ 23WhInput:mini ... digital devices at the same time.3,Full compatible with the most popular cell phone, smart phone etc. ... material.5,Powerful charger/discharge distinguish, smart device protection; With over charge/discharge, over loading, short circuit, lightning protection ...