54mm 2 Port USB 3.0 Laptop Express Card Support Win7 XP 2000 XP Vista WBTUO BC618T External USB Ports: 2 port USB 3.0 Operating Systems Supported: Support Windows XP, 2000, Vista and Windows 7, etc. Package Contents: 1X 2 Ports USB 3.0 ExpressCard 54mm Adapter. 1X USB DC Power Cable.