Compliant with USB 3.0 SuperSpeed specification Rev. 1.0. Compliant with Intels eXtensible host controller interface (xHCI) specification Rev. 0.95. Backward compatible with USB 2.0 and 1.1 devices. Supports data transfer rates up to 5.0 Gbps for blazing fast speeds! Supports 2 downstream ports for all speeds. Supports external power socket in order to supply each USB 3.0 port 900mA.