Powerocks Jelly Mobile Extended Rechargeable iPhone Battery Case for Apple iPhone 3G and 3Gs - Purple/White Extended battery case - 2000 mAh Purple/White Slim, low-profile design keeps iPhone portable Extends Battery Power: 7 Extra Hours Internet Use/8 Extra Hours Video Playback/9 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