The Dyad AC Adapter and Power Bank contains an ETL-certified 2,000 mAh/7.4Wh rechargeable lithium ion Grade A battery with enough power to charge smartphones, MP3 players and more. It includes a USB output and foldable prongs for AC input. It also features a power button and indicator lights that display remaining battery life. Output: 5V/1000mA. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents.