Dual Bay Trayless Mobile Rack for Two 2.5" SATA III Drive, SY-MRA25008 Fits in any 3.5 bay. Will work in external Tool free and driverless hard disk installation Removable internal enclosure 3.5 for two 2.5 SATA hard disks Removable enclosure 3.5 for two 2.5 SATA hard disks Compatible Hot Swap, RAID, SATA II. Led indicators for activity and power