Synology DX517. Chassis type: Desktop. Device class: Small & Medium Business. Number of storage drives supported: 5, Supported storage drive types: HDD & SSD, Supported storage drive interfaces: Serial ATA, Serial ATA II, Serial ATA III, Storage drive sizes supported: 2.5,3.5″. Width: 248 mm, Depth: 233 mm, Height: 157 mm, Weight: 3.91 kg. Product colour: Black