... 1.Leakage protection 2. Li Polymer Battery 3. usb output 4.CE,ROSH,FCC 2000mAh Power bank with dual USB ... protection, input oppose protection, input short-circuit protection, output short-circuit protection, output over-current protection etc.- Inside micro computer control- ... and discharging)---can charge PS-4800through computer USB port;C. Output tips: Micro USB tipMini USB tipTip for Apple iPhone4/ ...