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