ITEM NAME:4 Slots PCI-E 1x To 4 PCI Express 16x USB 3.0 External Riser Card Adapter Board Product Description Description: Features: 4 Slots brings great extendability. Plugs directly to the board without any extender cable, can be fixed to the case. PCI-E slot power solution, no extra power cable needed. Only one cable to the slot, easy and convenient to settle and install. With IC heat radiator. Specification: Bus Port: PCI-E Port Quantity: 4 X PCI-E USB Size: approx. 120 X 66 X 21 mm/4.72 X 2.6 X 0.83" Net Weight: approx. 41 g Gross Weight: approx. 73 g Package Size: approx. 130 X 90 X 25 mm/5.12 X 3.54 X 0.98" Supported OS: DOS, Linux, Windows XP/7/8/10 Included: 1 X 1 to 4 PCI-E Adapter Card 1 X Package Box.4 Slots brings great extendability. Bus Port: PCI-E. Port Quantity: 4 X PCI-E USB. Included:1 X 1 to 4 PCI-E Adapter Card. Plugs directly to the board without any extender cable, can be fixed to the case.