Features: brand new and high quality This 4-port USB PCI-E board supports USB 3.0 that can provide a fast data transmission speed, and it is powered by PCI-E interface, stable and secure. Effectively solve the problem of insufficient pci-e interfaces on the motherboard, one interface can be expanded to 4. The USB connector is gold-plated to reduce interference between interfaces and improve data integrity. The main control board adopts the direct power supply mode of the pci-e interface, and does not require an external power cord. The main control power supply is not affected by external interference and has higher stability. The plug-in card design can be directly connected to the motherboard interface without an extension cable, and can be connected to the chassis, which significantly improves the stability and reliability. Specifications: Item：PCI-E 4X 1 to 4 PCI-E Expansion Card Number of interfaces: PCI-E USB 3.0x 4 Product size: approx 120x75x55mm/4.72x2.75x2.2in Compatible system: Replacement for DOS / Linux/ WinXP/Win7/Win8/Win10. Bus interface: PCI-E X1 (for X4, X8, X16 graphics interface) Gross Weight: 80g Working Invironment: 0-70℃ Package Includes: 1 x PCI-E USB3.0 Expansion Card note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.