GLAM Midnight Blossom Power Mate Plus - Stylish Chic Smart Accessories made for iPhone 3GS, iPhone 4, iPhone 4S built-in lithium-ion battery charges via USB to computer system or power adapter Provides hours of extra use - battery life depends on device and usage Capacity: 1000mAh; Input/Output: 5V charge time: approx 3 hours; LED indicator