The Slim Aluminum 2,200 mAh Power Bank is a lithium polymer Grade A battery device powerful enough to charge smartphones, MP3 players and more. It also includes an LED light. The reusable power bank charges via a USB cable (included)which can recharge the battery backup or be used to charge devices with a micro-USB input like Android smartphones from Samsung®, Motorola®, HTC®, Nokia®, and others. A blue LED indicator light turns on when device is fully charged. Input: 5V/800mA. Output: 5V/1000mA.