MBT-32U-BK Dual Bay Mobile Rack External Enclosure For SATA Hard Drives Support 3.5” SATA I/II H.D.D. Support BIG & JBOD Up To 480 Mbps Data Transfer Rate In USB 2.0 Fan On/Off Function Combine 2 H.D.D.s Into One Massive Storage Mobile Rack Design Support Hot Plug & Play High Performance 50 x 50 mm Fan Aluminum case Dual H.D.D. LED Display Front LED For Power / H.D.D. Activity Expand Storage Easily Applicable for PC, Notebook, and Mac RoHS Compliant