RTM4R5EU3 RAID Tower Mini (black color) with HPM-XU hardware Port Multiplier installed. Install up to four 3.5" SATA hard drives of any capacity (drives not included). Drives are mounted onto the tower chassis using screws. Connect to system via USB 3.0 / 2.0 or eSATA port (connecting cables included).
For more detail, please visit product web page http://www.addonics.com/products/raid_tower/raid_tower_mst.asp