3.5" USB 2.0 Aluminum Enclosure-Silver Brushed Exterior. Solid Aluminum body for protection and excellent heat dissipation. Supports any capacity 3.5" ATA Hard Drives. Works with both Mac and PC computers Supports both Hi-Speed USB2.0 & USB1.1 connection. Stackable design. Supports hot plug and play. Active LED to indicate power and data access AC adaptor included