SuperSpeed data transfer rate up to 5Gbps - 10 times faster than USB 2.0. Compliant with USB 3.0 specification Revision 1.0. Backwards compatible with USB 2.0 and USB 1.1. (x4) USB ports for easy expansion. Bus Powered, USB 2.0 only - power adapter (included) needed for USB 3.0. Individual port over-current protection. Plug-n-Play, Hot swappable & Hot pluggable. Supports external power adapter jack in order to supplying power for each USB 3.0 connector up to 900mA MAX/port.