PhoneSuit Elite Battery Case for iPhone 4 and iPhone 4S Thinnest, Fastest Charging iPhone 4 Battery Case to provide over 100% power Provides True 100% iPhone 4 Recharge. High Capacity 2100mAh battery. Full Protection iPhone Case with Ultra Thin 17mm (0.67 in) Design Quick Charge technology fully charges your iPhone in less than 2 hours Apple Certified for performance and compatibility with iPhone 4 and 4S