3.5" USB 2.0 Aluminum Enclosure with Biometic Encryption-Silver w/black end caps. Biometic Encryption protects data 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