Icy Dock USB and Firewire External Enclosure. Size: 88.9 mm (3.5 "), Hard drive interface: Serial ATA II. Interface: USB2.0 + Firewire 400. Compatible operating systems: Windows 98/SE/ME/2000/XP/VISTA; Mac OS 9.0 +. Colour of product: Black. Dimensions (WxDxH): 142.6 x 194 x 42.6 mm