Backplane support for 4 port SAS/ SATA drives and 6 GB/s mini-sas SFF-8087. Supports four 2.5"/3.5" Sas/SATA HDD/SSD Includes three 80 x 15mm PWM fans Independent drive status LED. Supports four low profile PCI/ PCIe Slots Supports Micro ATX and Mini-ITX motherboards Auto lock handle for Easy to fixed the 2U rack mount on the cabinet