Synology RXD1215sas. Storage drive interface: Serial Attached SCSI (SAS), Storage drive size: 2.5/3.5". Device class: Large Enterprise Business. Number of storage drives supported: 12, Supported storage drive types: HDD & SSD. Width: 430 mm, Depth: 692 mm, Height: 88 mm, Weight: 18 kg. Product colour: Black