This PCI-E 1 to 4 riser board can extend 4 USB ports for you to connect, practical to use. The PCI-E 1 to 4 riser card features a PCI-E X1 interface that is compatible with an X4 X8 X16 interface, easy to connect.The PCI-E 1 to 4 riser adapter is easy to use, connect and use, no need for any external power cable.The PCI-E to USB card features gold-plated connectors, so the connector can provide a stable and fast connection.Thanks to the added BIOS, enhanced compatibility with motherboards and cards, the PCI-E expansion card reduces the power consumption.Specifications: Bus interface: PCI-E x 1.(Compatible with 4x, 8x, 16x/graphic card interface). Interface: PCI-E USB interface x 4. Compatible system: support for DOS, support for Linux, support for WinXP/Win7/Win8/Win10. Note: The color of the USB interface of the product is different for different batchesProduct Installation Instructions:1. The first step, when you use the adapter card, the computer needs to be turned off before they can plug the adapter card.2. The Second step, first of PCIe USB card plugged into the motherboard's PCIe slot. Use USB3.0 data cable adapter to connect the ends of the two USB port. Plug in 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 (Note: The first time to insert card to start the computer, into the system in universal will be prompted to install new hardware, such as "PCI standard PCI-to-PCI bridge" , you need to wait for it to automatically install the complete, individual antivirus software will prevent these files installation, note skipped), when your computer has been recognized the card,blue LED PCI slot on normallight, computer equipment manager in the system device will show an increase of several "PCI standard PCI-to-PCI bridge".After completing the above three steps, turn off the computer, plug in your PCI-E card, to be careful not to insert the contrary,Then boot into the system, install PCI-E Card Driver.Colour: blackMaterial: PCB+plastic+metalSize: 120 x 55 x 75mmPackage Contents:5 x USB 3.0 riser cardOnly 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.