Sas 3.5 Hotswap (Usb 1394A And 1394B) Sataii 2 Hard Drives In 1 Enclosure Device Type - 3.5 Hard Drive Trays x2 Dimensions WxDxH - 4.8"x7.9"x4" Weight - 3.7lbs Weight - 3.7lbs Storage Capacity - 1.5TB