Meet the offGRID Backup Battery Case. Promising to double the battery life of your iPhone 4, the offGRID is a portable power and case solution all in one. Weighing in at just two ounces and a thickness of only 6mm, the offGRID combines elegant design with usability, producing one super smart, slim, and protective case. The interior of the offGRID conceals an ultra thin rechargeable battery with an Apple Dock Connector plug, allowing you to charge your iPhone 4 while maintaining low-profile protection. Take this backup battery on the go for the most portable and innovative charging solution yet!