RAID HDD enclosure compatible with SATA 3.5-inch and 2.5-inch drives, supporting up to 20TB of storage. A Toshiba 1TB 2.5-inch HDD used for testing will be included as a bonus (a working HDD without errors). - Model: RAID TOWER 2 - Supported Sizes: SATA 3.5-inch, 2.5-inch - Maximum Capacity: 20TB - Connection Interface: USB 3.0 - Power: External Power Supply - Features: RAID Function Included accessories are the outer box shown in the image, instruction manual, the main unit, one 3.5-inch drive stay (the other 3 are already installed in the trays), screws for 2.5-inch drive installation, USB cable, and power adapter. It was used without any particular problems, but please understand that this is a used item before purchasing.