Item DescriptionExtend with 2 USB3.0 19pin connector (can expand 4 USB 3.0 ports) for standard desktop PC.SuperSpeed USB 3.0 is fully compatible with original USB system, peripherals and cables.Fully compliant with onelane (x1) PCI 2.0 specification.TWO external 5Gbps SuperSpeed USB 3.0 ports.One 19pin internal 5Gbps SuperSpeed USB 3.0 port.SuperSpeed USB 3.0 offers 10 times performance increase over HiSpeed USB 2.0.USB 3.0 complies with extensible Host Controller Interface (xHCI).Up to 5Gbps maximum transfer rate.SuperSpeed USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices (data transfer rate at 1.5/12/480Mbps).Supports PCI Low profile.Fully PlugNPlay and Hot Swap compatible.No external supply.System Support: Windows XP / Windows7/Windows8,Windows8.1,Windows10Fit PCI-E 1x,4x,8x,16x slot motherboardBoard Size:(L x W) 9.00 x 6.90cm/3.54 inch x 2.72 inch (Approx.)Colour: BlackMaterial: plastic + metalPackage Contents:1 x PCI Adapter Card1 x Low Profile BracketOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.