MiLi Power Angel HI-A10 External Battery with Stand for iPhone 4 / 4S, iPhone 3G / 3G S and iPod (Black) External battery with stand for iPhone 2G, 3G, 3Gs and iPod Petite, convenient, easy to use, high capacity Use USB cable to charge MiLi Power Angel When using the MiLi Power Spring with your iPhone, you can sync your iPhone with iTunes without removing the MiLi Power Spring Technical Specs - Input: 5V-05A, Output: 5V-05A, Capacity: 1200 mAh(Li-Pol), Standby Time: Up to 230 hours, Product Dimension: 617  54  132 mm