Front and back double-sided 4-disk expansion at the same time Compatible with 2242/2260/2280/22110 specifications Support M.2 M-KEY NVME protocol SSD and Optane support M.2 PCle protocol expansion cards and devices LED soft light indicator When the disk is plugged in and powered on, the green light is on, and the green light flashes when reading and writing. The read rate of PCI-E4.0 RAID O mode can reach 14000+Mb/S. This product can run 4 NVMEs at the same time. But the motherboard must support PCIE signal splitting. Using high-end PCB circuit board, surface gold plating process, good continuity, strong wear resistance, anti-oxidation, high fire rating Name: Double-sided 4-disk NVME raid PCI-E X16 split card Model: PH44PRO Support hard disk: M. 2NVME protocol SSD/M. 2 PCI-E device transfer speed: 4 x 32Gbps Colour: Black Material: PCB Package Contents: 2 x NVME PCI-E X16 expansion card 2 x screw packs 2 x screwdriver 2 x short baffle 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.