It allow users -ports USB 3.1 Type desktop computers by PCI slot. The 2X USB 3.1 type C ports can provide ultra speeds 10Gbps max data transfer for USB 3.1 peripheral device, such as SSD enclosure, external HDDs, flash drives, USB hubs etc. Features - Color: Black. - Size: 12.00X8.50X2.00cm/4.72X3.34X0.79in - Material: PCB. - USB3.1 high- , reads and writes in seconds to transfer all kinds of large files, open instantly and without waiting. - Supports the new PCI-E 3.0 specification and is backward compatible with the PCI-E 2.0 specification. Applicable interfaces: PCI-E 2X, PCI-E 4X, PCI-E 8X, PCI-E 16X. - The master controller has passed the , which corresponds to the new .1 of the USB3.1 specification formulated by . - Integrated all-solid capacitor, equipped with high power, high grade electrical components, all metal heatsink, increase anti-interference ability, improve data transmission stability, and keep cooling. - The perfect workmanship will give you an excellent use experience. Package list: 1 x Expansion Card