Introducing the Icy Dock MB994SP-4S Quad Bay 2.5" SATA/SAS Mobile Rack for use in a single 5.25" device bay. This product is constructed of heavy duty metal to hold up in the toughest of conditions. It includes ventilation slots on the front & back for maximum airflow to keep both SATA and SAS drives running cool, and an LED is placed on the front of each drive tray to give the user drive status at all times. Dual 4-pin power connectors are used to ensure a consistent power supply to all 4 drives, whether they are low power SSD's or power hungry 15000 RPM SAS drives. Also included are dual 40mm cooling fans to keep the drives running in at optimal temperatures in even the most intense applications.