★ Users can add 4 USB 3.0 ports to their desktop computer to further light up USB devices such as mouse, keyboard, hub, flash drive, hard drive, etc. ★ PRODUCT FEATURES: ➤ Expands 4 USB 3.0 ports. ➤ Up to 5Gbps transmission speed of USB 3.0 ➤ Supports up to 4 USB 3.0 devices ➤ Self-powered technology ➤ No need to connect power cord ➤ Supports hot plug, plug and play. ➤ Supports multiple USB 3.0, USB 2.0, and USB 1.1 devices. ➤ Fully Compliant with PCI Express BaseSpecification Revision 2.0 ➤ Support Windows XP / Vista /7/8 / 8.1 / 10 (32/64bit) ➤ Applicable Slots: PCI-ExpressX1 / X4 / X8 / X16 Slots ➤ Product Size: 6.5cm x 7.8cm Installation Instruction 1: Correct installation and computer motherboard PCIE slot. 2:Use the corresponding fixing screws to fix the PCIE baffle and computer case. - Supported OS: Windows XP/Vista(32/64 bit) /7/8/10 - Windows XP/Vista/7/8/8.1 (32/64 bit) - Support win 8 and Win10 without driver Win8.1 and above system can be used without a driver. - If you have win 7 and win8, you can start the folder name (DRV)-(720201)-(R30230.exe) in the included mini CD and then reboot to recognize it. - This product does not support Linux or Mac OS. - Only works with PCI-E slot and does not work with PCI slot. - Do not install this PCI-E card when computer is powered on. - If the operating system is correct and the expansion card is not still detected after installation, please check the PCIE slot on the computer motherboard for contact failure. If you have any other questions, please contact us at any time, we will reply you as soon as possible. ★ PRODUCT LIST: - USB 3.0 (4 Ports) PCI-E Expansion Card x 1 - Driver CD x 1 - Screwdriver x 1 ★ We have professional R&D team and continue to launch new products to meet the needs of customers and appreciate your support! (1)Strict Quality Control (100% Tested):In order to provide buyers with a comfortable shopping experience, each item of MHQJRH is carefully inspected and well packed before shipping. (2)Fast and Professional Service: We have a professional after-sales service team, buyers questions and problems will be answered within 24 hours (including holidays). (3) 12 Month Warranty and 100% Money Back Guarantee: We offer 12 months warranty for all products sold by Amazon. If you are not satisfied with the product, you will get a 100% money back.