Model: NST-640S3R-BK Device Support: SATA I/II/III Hard Drivers Device Size: 4 bay for 3.5" HDD Internal Interface: SATA External Interface: USB 3.0(Backwards Compatible With USB 2.0 & 1.1), eSATA HD Capacity: 10TB per bay*, Up to 40TB total* Material: Aluminum & Plastic Fan: 80 mm Dimension: 209 x 170 x 181 mm USB Cable Length: 914mm (36 inches) System Requirements: Microsoft Windows XP, Vista, 7, 8, 8.1, 10 Mac OS X v10.4 and greater USB 2.0, 3.0 or eSATA Equipped System For USB 3.0 Connection, the USB 3.0 port on the System Must Support USB 3.0 Specifications For eSATA Connection, the eSATA port on the System Must Support eSATA Specifications Port Multiplier may be required for eSATA depending on the configuration of the drives NexStar HX4R Enclosure, Power Adapter, USB 3.0 Cable, eSATA Cable, User"s Manual