1. Allows user to use standard M.2 M-Key nVME SSD to PCIe x4 or x8 or x16 slot of the Desktop PC, But speed at 4X speed only 2. Support 2242 or 2260 or 2280 type M.2 Card dimension 3. Only support M.2 Socket 3 PCI-e-based M Key SSD, doesn't support M.2 SATA bus B key SSD 4. The cooling fan is designed for active cooling mode, the SSD heat can be discharged in time. 5. LED switch can control the LED Power ON or OFF, it will not bring the dazzling feeling when you use it in the night. Material: ABS colour: Black Specifications: 5cm Package Contents: 1 x M.2 SSD to PCI- E 4X adapter 4 x M2 screw 2 x M.2 nut 1 x screwdriver 3 x PCB Extension Board Only the above package content, other products are not included. Note: Light reflection 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.