carry hours of back up power with you wherever you go. works with mobile phones, iPhone®, mp 3 players & bluetooth headsets using a series of interchangeable tips. 3000 m Ah battery can fully charge an iPhone® 3 times before a re-charge is needed energy saving function stops power to your device once its fully charged charges from USB (Universal Serial Bus) port multiple tips for iPhone®, mini & micro USB (Universal Serial Bus) devices, nokia, sony ericsson, samsung & LGdevices