Amstron's UltraXP-4.7 Portable Power System is the perfect companion for your PDA, iPhone, iPod, Cell phone, and most other USB powered devices. This high capacity universal USB power pack battery is small enough to fit in the palm of your hand, yet provides 4700mAh of power; ideal for long flights and business trips. This Portable Power System also comes equiped with a vivid LED battery indicator display that lets you know how much battery power is left. The UltraXP-4.7 battery pack can be recharged from any computer USB port. Never be caught without power again on vacations, business trips or long drives. Stay connected and charged with the UltraXP-4.7 external power battery. Features Charges: Cell Phones, iPod, iPhone, Digital Camera, MP3/MP4 Players and other USB Devices.