SuperSpeed USB 3.0 supports transfer speed of up to 5Gbps - The actual speeds limited by connected device"s settings. * Extend with 2 USB 3.0 downstream ports and 1 USB3.0 20-pin Connector (can expand another two USB 3.0 ports) for standard desktop PC. * Backwards compatible with USB 2.0 and 1.1 devices. The PCI-E Port support PCI-E X1/X16 slots. * 4-pin DC connector to power USB devices from your PC power supply. * Free lifetime technical support and free 18 Months Manufacturer Warranty from Anker.