Enermax EB211ES. Size: 63.5 mm (2.5 "), Hard drive interface: USB 2.0, eSATA. Interface: USB 2.0. Compatible operating systems: Windows XP / Vista / 7, Mac OS 10.2. Colour of product: Black. Dimensions (WxDxH): 78 x 134 x 16 mm, Weight: 70 g