PwrVault is a fully integrated; form fitted rapid-charging case. With easy insert and snap design, on/off button to control usage, the PwrVault doubles battery life offering additional hours of internet, video, GPS and music. At 0.72 inches thin, PwrVault is ergonomic, shock-resistant and simple to use. The four blue LED power indicators display battery status. Our durable rubberized finish, tapered edges and contoured design provide for secure handling and comfortable long-term usage. This must have power accessory for iPhone 4 offers four corner coverage and direct Sync to computer without the need for an iPhone cable.