Using 4-layer circuit board: it has very strong anti-interference ability, effectively ensuring the stability of PCI-E high-speed signal transmission, data integrity, impedance matching, PCIE interface expansion effectively solves the problem of insufficient PCI-E interface. This product can expand 4 PCI-E Fast startup, high-speed loading and file transfer. Low power consumption, quiet, reliable and durable. High gold plating: strong oxidation resistance, good conductivity and wear resistance. Product Model: M.2 NVME TO 4 PCI-E 1X Main control chip: ASM1184E Product interface: M.2 KEY PCIE Number of interfaces: Pci-E X1 interface*4 Support system: WIN7 WIN8 WIN10 WIN11 LINUX Precautions: A: Please confirm that the motherboard has a KEY-M M.2 slot, M.2 SATA cannot be used B: USB30 cannot be plugged into USB devices, only the matching USB graphics card extension cable can be connected C: M.2 slot must support 22x80MM size D: The imported main control is compatible, supports PCI-E2.0, and the speed is fast Colour:black Material:PCB+Metal Package Contents: 1 x Riser Card 1 x Screw Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.