3.5" USB 2.0 /1394A Aluminum Enclosure-Silver. Solid Aluminum body for protection and excellent heat dissipation Shock absorbent rubber strip on top and bottom Supports any capacity 3.5" ATA Hard Drives Works with both Mac and PC computers Supports both USB2.0 & USB1.1 connection Supports IEEE 1394A FireWire connection Dual FireWire ports for daisy chain Stackable design Supports hot plug and play Active LED to indicate power and data access AC adaptor included