Features: brand new and high quality PCIE for express to 8-port independent usb 3.0 4-channel expansion card Bus type: pci-e x4 (for pci-e x4/x8/x16) Interface: external 4-port usb 3.0 internal adapter two 19-pin usb 3.0 ports (each 19-pin header can be converted to 2-port usb 3.0) Four channels, independent bandwidth,professional and durable. Each interface is equipped with independent for protection insurance, a total of 9 insurances, so as to protect the peripherals and the computer from damage. Specifications: Size:as Picture Shows Support system: for windows xp/vista/win7/win8/win8.1/win10 Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x 8-port USB 3.0 PCIE Expansion Card, 1 x Low Profile Bracket .