... power pack 3.high capacity 4500mA universal power pack for ipad,ipad2 Description:It is a rechargeable backup battery ... from 25%,50%,75%,100%7) Press the button for about two seconds to turn it on or off, ... So it is optional for users to charge their Iphone 4G or not.8) ... and six connectors( Sony ericcson, Nokia,Micro USB, iphone, PSP), we use female connector, so you only need one ...