Product features: 1. Allows user to use standard M.2 M-Key nVME SSD to PCIe x4/x8/x16 slot of the Desktop PC, But speed at 4X speed only 2. Support 2242/2260/2280 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/OFF, it not bring the dazzling feeling when you use it in the night. Material: ABS colour: Black Specifications: 5cm Note: If there are slight differences in accessories, it does not affect use. 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.