This product is either discontinued or we cannot get that from suppliers.
QNAP TS-431P 4-Bay NAS Enclosure, AnnapurnaLabs, an Amazon company Alpine AL212, 2-core, 1.7GHz, 32-bit ARM, 1GB DDR3, 1GB DDR3, 512 MB, 4x 3.5-inch SATA 6Gb/s, 3Gb/s, Tower, Power, Status, LA, USB, HDD1-4, Power, Reset, USB Auto Copy, Fan 1 x 120mm, 12VDC.
The TS-431P is a powerful yet easy-to-use network storage center for backup, synchronization, remote access, and home entertainment with many feature-rich apps available, including Notes Station (create digital notes on a secure private cloud and share with colleagues and friends).