Power Rover 4000mAh Universal Portable Power Charging Bank (Blue) Perfect combination of luxurious texture, ultra-thin design and easy to carry functionality...4 fun colors to choose. Power Rover uses a high-tech polymer lithium battery cell and has a standard USB output. The device offers a circuit protection feature to prevent overcharging. Compatible with many devices: Tablet PC's, PSP, iPod, iPhone, Mobile phones (Nokia, Sumsung, Sony Ericsson, Motorola) and more Great for traveling, outages, emergencies and many other situations