Features: brand new and high quality 4 Slots brings great extendability, good electrical conductivity, improve data transmission efficiency. High-quality PCB board, high temperature resistance, can be used for a long for time. Plugs directly to the board without any extender cable, can be fixed to the for case. 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. Effectively solve the problem of insufficient pci-e interfaces on the motherboard, one interface can be expanded to 4. Specifications: Bus Port: PCI-E Interface Type: PCI-E 1X to 4-port USB 3.0 Applicable Card Slot: PCI-E X1/X4/X8/X16 Size: approx 120x81x61mm/4.72x3.18x2.4in Weight: approx. 48g Supported OS: DOS,Linux for Windows XP/7/8/10 Package Includes: 1 x PCI-E 1 to 4 Riser 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.