IOGEAR GearPower 2400mAh Capacity Mobile Power Station for Smartphones/Mobile Devices, GMP2K 2,400mAh li-poly cell provides a compact, super high-capacity battery Provides fast, convenient charging of most smartphones, Mp3 players & other USB-charged devices Perfect for mobile users & business travelers when conventional AC Outlets are not available 1a output capable of quickly charging iPhone/iPod & most smartphones Built-in short-circuit, overcharge & temperature protection