Coolmax HD-338D-U2 3.5" Hard Drive Enclosure with USB 2.0 and Data Backup 3.5-inch USB 2.0 external hard drive enclosure for Mac and PC Up to 480 Mbps transfer rate Built-in hot swap technology for easy connect and disconnect Includes 1-touch backup software and power adapter 30 x 200 x 117 millimeters (HxWxL)