This is a 2 Port USB 3.0 PCI Express Card which complies with USB 3.0 Specification, and Intel's extensible Host ControllerInter  This is a 2 Port USB 3.0 PCI Express Card which complies with USB 3.0 Specification, and Intel’s extensible Host Controller Interface (xHCI). It has PCI Express® bus interface, and it is applicable for PCI Express solution for host PC system. It works up to 5 Gbps for data transfer when connecting to USB 3.0 compliant peripherals, while maintaining compatibility with existing USB peripheral devices. It can work on Windows 7, Vista, XP with additional driver.   Features 1,Support USB 3.0 Super Speed mode max 5Gbps, Support USB 2.0 high speed mode 480Mbps, support USB 2.0 full speed 12Mbps, support USB 2.0 low speed 1.5Mbps.2,Compliant with Intel’s extensible Host Controller Interface (xHCI) Specification revision 0.953,Compliant with PCI Express® Base Specification 2.04,Max 900mA output per port.5,Support OS:Window Vista, Window XP, Windows 7. Note: Specifications are subject to change without notice

2 Port USB 3.0 PCI Express Card