Description: This 4-port USB PCI-E board USB 3.0 that can provide a fast data transmission speed, and it is powered by PCI-E interface, stable and secure, 4 Slots brings great extendability. The PCI-E to USB extender card features a PCI-E X1 bus interface, you can connect it with 4x, 8x, 16x/graphic card interface The PCI-E to USB riser card features a simple installation, you can easily know the work status. The PCI-E X1 to USB adapter is easy to use and can be used in many kinds of computer OS. The PCI-E to USB adapter can provide 4 PCI-E USB ports, so you will have more ports to connect. Specification: Bus interface: PCI-E x 1.(Compatible with 4x, 8x, 16x/graphic card interface) Interface: PCI-E USB interface x 4. Size: Approx.120 x 67x 57mm/4.7 x 2.6 x 2.2 inch Compatible system: replacement for Linux, replacement for WinXP/Win7/Win8/Win10. Package Includes: 1x USB 3.0 riser card.(2 Pack) Note: 1. The first step, when you use the adapter card, the computer needs to be turned off before they can connect the adapter card. 2. The Second step, connect to the motherboard's PCI-E slot. Use USB3.0 data cable adapter to connect the ends of the two USB port. Connect the power supply. 3. The third step: After completion of the above two steps, first in no hurry to insert your PCI-E card, start the computer to see if your computer has been identified to the riser card, if you did not find the card, repeat the above operation.