New Backup Battery External Power Station for iPhone 3G High Quality 1000MA Li-ion Cell Backup Battery for iPhone 3G, it also compatible with iPhone, iPod Touch, Nano, Classic, Video, etc. When your iPhone or iPod is no power, just connect this backup power to charge it and keep talking or playing music. Built-In USB Cable. Direct USB charging from computer or USB adaptor. Recharge up to 1000 times. Imput: 5V/500MA, Output: 5V/500MA. 4 LED shows charging status.