SaFPWR Fusion iPhone 4 Battery Case Charger - Battery - Retail Packaging - Black Rechargeble patented smart battery inside an ultra-thin, ultra-lightweight, low profile, soft touch, polycarbonate case; made for iPhone 4. Patented Energy Management Technology doubles your iPhone run time and extends your iPhone battery life Adds up to 7 hours of additional talk time and up to 6 hours of additional web browsing on 3G ( 11 hours Wi-Fi) to your iPhone battery Charge and sync your iPhone to iTunes while in the FUSION battery case with the included USB cable LEDs on back of case allow you to see how much battery is left in the case