4-Port USB Charger allows you to charge up to 4 devices (iPhone / iPad / Smartphone / Tablet / DC /MP3 / MP4 / PSP and other devices) at once. It contains totally 5V/4A(Each port 1A) for you to charge your devices flexibility. Built-in over-current, over-voltage, overload automatic protection. It's an ideal solution for you or your family /friends and colleagues to charging or powering devices easily.