iPartner Wave Case and Rechargeable Battery for iPhone 3GS and 3G Double the battery life of iPhone 3G/3Gs with the iPartner Wave Certified Made for iPhone. The Made for iPhone means that an electronic accessory has been designed to connect specifically to iPhone and has been certified by the developer to meet Apple performance standards. CTIA (Cellular Telecommunications Industry Association) Certified Battery The iPartner Wave features a unique design to fit the relaxed posture of your handPass-Through USB: Charge and sync your iPhone 3G/3Gs to iTunes without removing your iPhone via the included USB cable. Charging: You can use the included USB cable to charge the iPartner Wave and iPhone simultaneously.