Simultaneously charge two USB-powered devices via a wall outlet at home or the charger's internal battery on the road. Plug it in to an outlet and easily power up the internal battery. International input voltage allows you to use it overseas—no converter required. Eliminate the hassle and waste of multiple chargers with the interchangeable power tips that are compatible with thousands of USB-powered devices. Adapter/Charger Type: Portable Mobile Charger; For Device Type: USB-Powered Device; Power Source(s): AC Wall Outlet, Internal Battery.