Iwalk battery backup-Rechargeable universal backup battery compatible w/ almost any smartphone. Works w/iPhone (even new iPhone5). Android Phones including Galaxy S3, Blackberries & more. 7 Connector types included 1800mAh capacity lithium ion battery. Built-in smart circuitry protection design keep your devices from overcharge, overheat and short circuits. Front color LED shows current charge status. Charge via USB port with supplied USB cable. Comes with travel pouch.