[M.2 NVMe to PCIe]: Expands 4 PCIe x1 interfaces through the M.2 B+M-KEY PCIe interface, effectively solving the dilemma of insufficient PCI-E interfaces, mainly used for Ethereum mining equipment or GPU mining equipment. [M.2 to 4-port PCIe]: The adapter card's 4 ports output all PCI-E x1 signals and cannot be connected to USB devices. For mining equipment use only. [Simple Design]: Directly connected to the motherboard without any extension cable, it can be fixed to the chassis, effectively reducing interface interference and cable loss, improving data reliability and work efficiency. [Heat Dissipation Design]: The full aluminum heatsink covers the ASM1184E chip to prevent overheating and ensure stability. The underside of the short card is reinforced to protect the product from deformation. Compatible with: Linux, Windows XP/7/8/10/11. Power must be turned off before inserting a PCI-E card. Color: Black Material: Plastic Size: 12.50 x 7.29 x 2.69 cm Package Contents: 1 x PCIe Adapter Card (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.