Charge two devices at once with the Rock Solid Dual USB to Wall Adapter from TetherTools. This wall charger is equipped with a standard US plug and two USB ports that output a total of up to 2.4A of power. When both ports are in use, they put out up to 1.2A. When only one port is in use, the power output will be 2.4A. The charger features foldable prongs for easy storage and portability.