Cavalry EN-CAU3G-TB 2.5 USB 3.0 External Enclosure Dimensions: 5.25 x 3.25 x 0.75 (L x H x W) Operating Systems Supported: Windows XP / Vista / 7 + (32-bit & 64-bit) Mac OS X 10.4.8 + (requires reformatting) Weight: 0.2 lbs. Package Contents: External Hard Drive USB 3.0 Y-cable User Manual