Features: brand new and high quality Advanced USB 3.1 technology:SuperSpeed ​​USB 3.1 supports data transfer speed of up to 10Gbps, twice as fast as USB 3.0, 20 times as fast as USB 2.0. Two reversible Type-A ports:Add two USB 3.1 Type-A (USB-A) downstream connectors for standard desktop computers. 2 reversible Type-A ports easily connect to 2 Type-A enabled devices simultaneously, no matter which side you connect to. Excellent performance:The Sata 15-pin power connector supplies power to USB-A enabled devices and supports up to 5V output on each USB 3.1 port. Easy to use:The built-in hot-swap feature allows you to replace computer system components without shutting down the system. Wide compatibility:Works with any PCIe x4, PCIe x8, and PCIe x16 slot. for USB 3.0, USB 2.0 and USB 1.1 devices. for Windows 10 / 8.1 / 8/7 / XP / Vista operating systems. Specifications: Product Name: PCI-Express 3.0 to Dual USB3.1 Expansion Card Bus Type: PCI-E X4 (for PCI-E X4 / X8 / X16) Main chip: for ASMedia ASM3142 Interface: 2 USB3.1 ports (maximum power 5V / of each USB3.1 2A). Rate: 10gbps Work Environment: 0-70 degrees Product Weight: 85g Features: Expand USB 3.1 interface, connect USB peripherals quickly! Support system: for Windows XP / WIN7 / WIN8 / WIN8.1 / WIN10 ect. Package Includes: 1 x 2-port USB 3.1 PCI for Express Card note: Due to different monitor and light effect, the actual color of the item may be slightly different from the color shown in the pictures. Thanks! Please allow 1-2cm measurement deviation due to manual measurement.