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-C ports:Add two USB 3.1 Type-C (USB-C) downstream connectors for standard desktop computers. 2 reversible Type-C ports easily connect to 2 Type-C enabled devices simultaneously, no matter which side you connect to. Excellent performance:The Sata 15-pin power connector supplies power to USB-C enabled devices and supports up to 5V 900mAh 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: Material: PCB, galvanized sheet steel Chipset: ASM3142 Color: black Interface: 2 USB 3.1 Type-C ports Data transfer rates: up to 10 Gbps (when connecting to USB 3.1 compliant peripherals) Backward for USB 3.0, USB 2.0 and USB 1.1 Compatible OS: For Windows 10 / 8.1 / 8/7 / XP / Vista OS Compatible Slot: PCIe x4, PCIe x8, PCIe x16 Supports a maximum output power of 5V 900mAh to each USB 3.1 port Supports Super Speed + (10 Gbps), Super Speed (5 Gbps), High Speed (480 Mbps), and Full Speed Transaction (12 Mbps). Note: The actual transmission speed is limited by the settings of the connected computers and devices. Meets PCI for Express Base 3.0 specifications Complies with Universal Serial Bus 3.1 specification Note: It is not for macOS operating systems. 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. Package includes: 1 X USB 3.1 Dual Port Pci-express Card