2 in 1 Back-Up Battery Pack & AC Adaptor w/ 2 USB Ports...(1800mAh Li-ion Battery Pack). Supports mobile phone MP3 and other portable devices 2 USB ports for charging 2 devices at the same time Built-in AC adapter for self recharge and device charging Built-in short circuit over-charge and temperature protection 2 step LED display to show charge status and battery life Power on/light function Rechargeable over 500 times USB input and DC output and Includes USB mini and micro charge/sync cables