Extend your Iphone 4 battery life, more music,gaming, video playback time ... air for 4 is a rechargeable external battery, all in a protective and stylish design that even enhances sounds. ... and Send with your 4 The Moca Power Pack is not only adds battery life, it is a protective form-fitting case ... 5V, 500mAhInput:5V, 500mAh1700 mAh internal back up battery Packaging:1 X USB cableMoca Power Pack in the ...