This product is either discontinued or we cannot get that from suppliers.
QNAP TS-451DeU-2G 4-Bay 1U Diskless NAS Celeron J4025 2 Core 2.0GHz 2GB RAM, Intel® Celeron® J4025 dual-core 2.0 GHz processor, Intel HD 600, 2GB SO-DIMM DDR4, 4GB, 4x 3.5" SATA 6Gb/s, 3.5" SATA & 2.5" SATA HDD/SSD, Hot-Swappable, 2x M.2 2280 SATA 6Gb/s, 2x 2.5 Gigabit Ethernet Ports, 2x USB 2.0, 2x USB 3.2 Gen 1, 1U Rackmount, 100W, 100-240V.
TS-451DeU is compact, powerful, and integrates Intel® Celeron® dual-core 2.0 GHz processor and 2.5GbE transmission performance. It provides enterprises with a new option to introduce 2.5GbE storage environment to complete daily data backup and restor.