This product is either discontinued or we cannot get that from suppliers.
QNAP REXP-1220U-RP 2U rackmount, Three SAS 12Gbps 4x wide port, Power Button, Hard Drive 3.5" SAS/SATA 12/6Gb/s, SAS/SATA 3Gb/s hard drive or 2.5" SAS/SATA SSD, Operating temperature 0 - 40 °C (32°F - 104°F), Storage Temperature -20 - 70°C (-4°F - 158°F), Sound Level 46.1 db(A).
The REXP-1220U-RP expansion enclosure is designed for expanding the storage space on a QNAP NAS by connecting multiple expansion enclosures via high-speed mini SAS cables. Featuring a 12 Gbps SAS interface on the chassis.