Features:100% brand new and high qualitySuper Speed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected.Supports 2 downstream ports for all speeds.Low Energy Consumption.SATA 15PIN power supply, sufficient and stable power supply to ensure stable operation of equipment.Backwards compatible with USB 2.0 and 1.1 devices; Supports simultaneous operation of multiple USB 3.0/2.0/1.1 devicesOperating System Compatibility: Windows 10/8/8.1/7/Vista/XP 32/64-bit, Server 2003-2008 32/64-bit, Linux.Hot-swappable, plug and play; Enjoy copying videos, music, photos, data files between USB devices and the computer at blazing fast speeds. Firmware can be not only updated at any time, but upgraded directly online.Package Includes:1 x USB 3.0 Extension CardSpecifications:Main Chip: D720202Support interface: PCI-E 1X 4X 8X 16XSupport systerm: WinXP/Vista/Win7/Win8 32bit/64bit MAC10.8 and moreConformance to PCI-Express 2.0Conformance to USB 3.0 Super SpeedConformance to xHCI 1.0Maximum transmission rate up to 5Gbps, it is higher 10 times than 480Mb/s of USB2.0Compatible below with USB2.0, USB1.1, USB1.0Transmission rate: 5000/480/12/1.5MbpsUSB Power Output: 5V 2A(Max)Size : approx 12x8cm/4.72x3.15innote:Please allow 1-3mm error due to manual measurement and there will be different color as different display, please understand. Thanks.