1. Four hard drives have LED work lights. 2. Steady power on, flashing when reading and writing. 3. NVME four-disk design, stable installation, can run 4 NVME disks at full speed at the same time. 4. Support 2U server small chassis installation, built-in multiple sets of high-power DC modules can continue to work stably. 5. With 4 hard drive Heat Sink, with high-quality thermal silica gel pad, quickly conduct heat to avoid overheating and slowing down; Specifications: Item name: PCIE X16 four-disk NVME expansion card Support : 22X80mm, 22X110mm NVMe SSD (not included in SSD ) Heat Sink: support M.2 interface 2280 specification solid state drive, suitable for single/double-sided chip particle SSDs suitable for M2 M Key SSD. Support: Only supports motherboards that can split PCIE channels. note: If there is any difference in accessories, it will not affect the product Material: plastic colour: black Package Contents: 1 x Adapter card 1 x Short baffle 1 x screwdriver 1 x Chassis fixing screws 4 x fixing screws 4 x fixing column 8 x Thermal silicone sheet 4 x Aluminum alloy heat sink 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.