The Span 1200 mAh Power Bank has a rechargeable lithium-ion battery (4.44Wh) that can charge smartphones, MP3 players and many other devices. It also features a key ring for easy carrying. Includes a USB-to-Micro-USB charging cable. Input 5V/1A, output 5V/1A. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents. Please charge power bank before initial use.