Features: Brand new and high quality Advanced USB 3.1 Technology: SuperSpeed USB 3.1 supports up to 10 Gbps data transfer rate, twice as fast as USB 3.0, 20 times faster than USB 2.0. Dual 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 plug in. Excellent Performance: The 15-Pin Sata 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: Built-in hot swapping feature lets you replace computer system components without shutting down the system. Wide Compatibility: Works with any PCIe x4, PCIe x8 and PCIe x16 slots. Backwards compatible with USB 3.0, USB 2.0 and USB 1.1 devices. Support for Windows 10 / 8.1 / 8 / 7 / XP / Vista operating systems. Specifications: Material: PCB, galvanized steel sheet Chipset: ASM3142 Color: Black Interface: 2 x USB 3.1 Type-C ports Data transfer rates: Up to 10 Gbps (when connecting to USB 3.1 compliant peripherals) Backward compatible with USB 3.0, USB 2.0 and USB 1.1 Compatible operating system: For Windows 10 / 8.1 / 8 / 7 / XP / Vista operating systems Compatible slot: PCIe x4, PCIe x8, PCIe x16 Support Max. 5V 900 mAh power to each USB 3.1 port Support SuperSpeed+ (10 Gbps), SuperSpeed (5 Gbps), HighSpeed (480 Mbps) and FullSpeed (12 Mbps) transaction Note: The actual transmission speed is limited by the settings of computers and connected devices. Complies with PCI for Express Base 3.0 specification Complies with Universal Serial Bus 3.1 specification Note: It is not for macOS operating system. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Package includes: 1 x Dual Port USB 3.1 PCI-Express Card