New ExoGear Battery Case For iPhone 3G/3GS - Provides Protection & Power - Retail Packaging 1300mAh lithium-ion polymer battery virtually doubles the life of the iPhone battery ExoClear technology for eliminates interference with your phone's reception ExoSync technology ensures quick, easy and precise syncing with iTunes ExoSave technology automatically turns off the exolife when it is not being used SLEEK POLYCARBONATE HARDSHELL CASE PROVIDES PROTECTION AGAINST BUMPS AND NIKCS