PCI Express X1 bus type, compatible with PCIe x1/x4/x8/x16 slots ompliant with USB 3.0 specification revision 1.0, backward compatible, supports low speed (1.5Mbps)/ (12Mbps)/high speed (480Mbps)/ultra high speed (5Gbps) USB interface supports all USB standards Supports external power socket to supply for each USB3.0 Fast speed and stable performance Product name:PCI-E to 2-port USB3.0 expansion card Transmission rate:Highest speed (5Gbps/s) Interface standard:PCI-Express interface USB3.0*2 Supported systems:for XP, Vista, WIN7, win8/WIN10, sever2003/2008 Vista, for Linux, for Dos, support win7/8/9/10 Colour:Black Material:PCB Package Contents: 1 * Expansion Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.