Macally MEGAPOWER52, 5200mAh Portable Travel Battery Charger for iPhone, iPod, iPad, Android, Tablets and Smartphones - Black/Red Built in 5200mAh rechargeable lithium ion battery LED display to indicate exact battery level percentage Auto turn on to charge and auto shut off to save battery life 2.1 max output, quickly and fully charges all iPhone models twice Compatible with iPad/tablets, iPhone/smartphones and most USB powered devices