The Slim Aluminum 2200 mAh Power Bank has a lithium polymer Grade A battery (8.14Wh) with enough to charge smartphones, MP3 players and more. It also includes an LED light that indicates when the device is charging. The reusable power bank charges via a USB cable (included), which can recharge the battery backup or other 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. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents.