Chasetac SuperSpeed USB 3.0 ExpressCard Adapter 2 Port Compliant USB3.0 /USB 2.0/USB 1.1 Specification Support Transfer Rate: Super-Speed (5000Mbps),High-Speed (4800Mbps), Full-Speed(12Mbps), Low-Speed (1.5Mbps) mode Expand two External USB 3.0 SuperSpeed Ports Driver Support for Xp, Vista, windows 7 Operation System Package: (CD Driver,Expresscard,power Cable, User's Manual).