Features:

SuperSpeed USB 3.0 is fully compatible with original USB system, peripherals and cables.

SuperSpeed USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices (data transfer rate at 1.5/12/480Mbps).

Extend with 2 USB 3.0 19pin connector (can expand 4 USB 3.0 ports) from desktop PC which with one free PCIe slot.

Two internal 5Gbps SuperSpeed USB 3.0 19pin headers.

SuperSpeed USB 3.0 offers 10 times performance increase over USB 2.0.

Up to 5Gbps maximum transfer rate.

Supports PCI express Low profile.

Fully Plug&Play and Hot Swap compatible.

No external power supply needed.

System Requirements:Windows 10/8.1/8/7/XP

Specs:

Chipset: VL805

Interface: PCIE X1 (fit X4, X8, X16, not fit PCI interface)

Interface No.: 2 x USB 3.0 20 pin (19 pin) 

Installation for desktop PCs with PCIe slot 

Package Included: 

1 x PCIe USB 3.0 20pin adapter card