Supports four 3.5” SATA HDD. Built-in power supply and three 40mm fans. Compact and screw-less design for easy HDD installation. Fully supports hot-swap function. Supports USB 3.0 Maximum 5Gbps transfer speed. Supports eSATA maximum 3Gbps transfer speed. Configurable RAID function (RAID 0, 1, 3, 5, 10, Combine, clear RAID).