Powerocks Leaf Slim Mobile Extended Rechargeable iPhone Battery Case for Apple iPhone 3G and 3Gs - Black Extended battery case - 1550 mAh BLACK Slim, low-profile design keeps iPhone portable Extends Battery Power: 5 Extra Hours Internet Use/6 Extra Hours Video Playback/7 Extra Hours Talk LEDs indicate amount of power left,Built in power ON/OFF Switch,charge your iPhone whenever you want Works with iPhone certified