Macally Hi-Speed USB2.0 External Storage Enclosure for dual 3.5" SATA HDD. Size: 88.9 mm (3.5 "), Hard drive interface: Serial ATA. Compatible operating systems: Windows 2000, XP, Vista, MacOS 9.2, MacOS X 10.1 - 10.5, Minimum system requirements: 1x USB. Colour of product: Silver. Material: Aluminium