Synology M2D18 Adapter Card PCIe Interface PCIe 2.0 x8, Driver Interface PCIe NVMe / SATA, Connector Type and Quantity M-key, 2 Slots, Supported Form Factor 2280 / 2260 / 2242, Bracket Height: Low Profile and Full Height, Operating Temperature 0°C to 40°C (32°F to 104°F), Storage Temperature -20°C to 60°C (-5°F to 140°F), Relative Humidity 5% to 95% RH. Synology Adapter Card Supporting M.2 SATA SSD NAS Accessories (M2D18) The dual M.2 SSD slots support both SATA and NVMe SSD, meaning higher SSD read/write caching and more primary drive bays re