Features: Super Speed USB3.0 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. Hot-swappable, plug-play; Low energy consumption. Sata 15PIN power supply, sufficient and stable power supply to ensure stable operation of equipment. USB3.0 Expand card,Backwards compatible withUSB2.0 and USB1.1 devices; Supports simultaneous operation of multiple USB3.0/usb2.0/usb1.1 devices With quick and easy installation, this USB3.0 PCI-express I/O Card offers- a simple solution for connecting to and using USB3.0 devices on your standard desktop PC. Specifications: Main chip: uPD720201 Support interface: PCI-E 1X 4X 8X 16X Support systerm: WinXP/Vista-/Win7/Win8 32bit/64bit MAC10.8 and more Conformance to PCI-Express2.0 Conformance to USB3.0 SuperSpeed Conformance to xHCI 1.0 Interface type: NGFF- PCI-Express Maximum transmission rate up to 5Gbps, it is 10times higher- than 480Mb/-s of USB2.0 Compatible below-with USB2.0, USB-1.1-, USB1.0 Transmission rate: 5000/480/12/1.5Mbps USB Power Output: 5V 2A(Max-) Package Includes: 1 x USB3.0 Extension Card note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!