Feature: 1. 2 Ports: Allows users to add 2 (1 USB A and 1 USB C port) USB 3.1 Gen2 ports to a desktop computer via a PCI Express X4 slot. 2. 10Gbps Data Transfer Rate: Additional USB 3.1 Gen2 USB ports can provide a maximum data transfer rate of 10Gbps for Ultra USB 3.1 gen2 peripherals such as SSD enclosures, external HDDs, flash drives, USB hubs, 4K video adapters, etc. 3. USB 3.1 Mutiple INs Function: 3rd generation USB 3.1 Gen2 host controller based on ASMedia ASM3142. Supports USB 3.1 Mutiple INs function, which will automatically coordinate the bandwidth of each USB port. 4. Self Powered Technology: Built in self powered technology. No need to plug any power cords from the mains, but let each USB port 5V/3A (5V/6A total, not for fast charging) maximum power. 5. Compatible Systems: Plug and play on for OS x 10.9.x, for 10.10.x, for 10.12.x, for 10.13.x, for 10.14.x, 10.15.x and later systems. Not available for OS x 10.11.x systems. for Windows 10,8.1,8(32/64bit), for Windows Server 2012,2012R2,2016,2019 driver free. Drivers need to be installed on for Windows7, for Server 2008, 2008R2 (32/64bit). Most mainstream for Linux Kernels are supported. Specification: Item Type: PCIE to USB 3.1 Expansion Card Material: PCB Total Interface: Pcie X4 (can Be Used for Pcie X8 X16 Graphics Card Interface) Expansion Interface: 1xUSB C, 1xUSB C Main Control Model: ASM3142 Transmission Rate: 10Gbps Support Chassis: Full Support for Large and Small Chassis Features: 1.Allows Users to Add 2x Usb 3.1 Gen2 (1x Type A and 1x Type C) Superspeed 10gbps Ports to Desktop Computers for Video, Photo or File Transfer and Real Time Data Storage. 2.Built in Febsmart Technology for Self Powered Hdd ssd Enclosures, VR Sensors and Other High Power Data Devices, It Also Provides Stable and Fast Connections for Common Usb Devices, Including Webcams, Mice, Keyboards, Smartphones, KVM Switches , Usb Hub, Etc. 3.Adding a Usb 3.1 Gen2 Port to a Desktop Computer is a Low Cost and Effective Method. the Added 2x on the Usb Port Does Not Take Up the Motherboard Usb Main Lan Speed, Just Extra Bandwidth Through the Pci Express X4 on the Computer or Server.. Package List: 1 x PCIE to USB 3.1 Expansion Card1 x Metal Baffle1 x Screw