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On the go power for the iPhone 4/4S in a light-weight and ultra-thin external rechargeable battery case. The Hip Street Boost case is designed to virtually double the time you have to Rock, Talk, Surf and Send with your iPhone 4!. The Boost case is a rechargeable external battery concealed inside of a protective form-fitting case for the iPhone 4/4S. It offers you the full protection of a hard-shell case while providing virtually twice the battery life of the iPhone alone; all in an ultra-thin, light-weight, low-profile design. You can Boost and charge your iPhone 4/4S at the same time. There is a convenient On-Off button, allowing you control on when you want to charge your iPhone 4G. Intergrated LED provide status on the amount of charge left over in the Boost Case.