The Pep 4,000 mAh Power Bank is a lightweight, rechargeable lithium polymer Grade A battery (14.8Wh) device powerful enough to charge smartphones, MP3 players and more. This reusable power bank charges via a USB to Micro cable (included) which can recharge the battery backup or be used to charge up devices with a micro-USB input, like Android smartphones from Samsung®, Motorola®, HTC®, Nokia® and others. Input: 5V/1000mA. Output: 5V/1000mA. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents. Please charge power bank before initial use.