Specifications :2 x external and 2 x internal USB3.0 port with 20 Pin ConnectorsEach port provides DC 5V 1A via USB 3.0 connectorVIA VL 800 / 801 chip setComplies with PCI Express Base Specification Revision 2.0Complies with Universal Serial Bus 3.0 specification Revision 1.0Backward compatible to USB 2.0 and PCI-Express 1.0Connect to PC power supply to provide enough current for each portTransfer Rate: 5Gbps 480Mbps, 12MbpsFully compatible with USB2.0 , USB 1.1Supports Windows 2000/XP/2003/Vista/7/8Fits perfectly with our 2 Port USB 3.0 front panel ( SE-FP-USB3-22M ) ( not included )Package contents :1 x PCIE USB 3.0 adapter1 x Driver CD