4 Ports USB output to support syncing or charging 4 devices at the same time. Compliant with USB 2.0 and backward with USB 1.1. Compliant with USB battery charging specifition revision 1.2 (BC1.2) . Connecting to power adapter, with an USB charging hub that connect to computer, it is a USB 2.0 data hub. Automatic handle the charging request when B.C. compliant devices is detected. Charging current can draw up to 1.5A (CDP or DCP mode) each port. Supporting Apple i-Pad fast charging mode. It is convenient and easy to use and carry. Built is USB cable, portable and lightweight !