Macally Hi-Speed USB2.0 HDD Enclosure. Size: 88.9 mm (3.5 "). Compatible operating systems: Windows 98SE / Windows ME / Windows 2000 / Windows XP. Mac OS 9.2, Mac OS X 10.1 to 10.4., Minimum system requirements: Desktop/notebook computer + USB. Colour of product: Grey. Dimensions (WxDxH): 63.5 x 241.3 x 279.4 mm, Width: 63.5 mm, Depth: 241.3 mm. Material: Aluminium