Features: brand new and high quality Advanced USB 3.1 Technology:SuperSpeed USB 3.1 supports up to 10Gbps 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 PCs. 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 function allows you to replace computer system components without shutting down the system. Wide Compatibility:Work with any PCIe x4, PCIe x8 and PCIe x16 slot. Backward for 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 sheet steel 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 for 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 output 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. Compliant with PCI for Express Base 3.0 Specification Compliant with Universal Serial Bus 3.1 Specification Package Includes: 1 x Dual Port USB 3.1 PCI-Express Card 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.