The Slim Card 2000 mAh Power Bank is a rechargeable lithium polymer Grade A battery (7.4Wh) with enough power to charge smartphones, MP3 players and more. The perfect size for your pocket, wallet or bag, the reusable power bank charges via 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. Input: 5V/500mA. Output: 5V/1000mA. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents.