Conceptronic CHD2ULB. Size: 63.5 mm (2.5 "), Hard drive interface: EIDE/ATA, Parallel ATA. Interface: USB. Compatible operating systems: Windows XP Windows Vista Windows 7, Minimum system requirements: USB. Colour of product: Black. Dimensions (WxDxH): 84 x 135 x 18 mm, Weight: 70 g, Width: 84 mm