This product is either discontinued or we cannot get that from suppliers.
QNAP TS-453BE-2G 4 Bay Diskless NAS, Intel Celeron J3455 quad-core 1.5GHz, up to 2.3GHz, 2GB (1x 2GB) DDR3L, 4x 3.5"/2.5" SATA 6Gb/s HDD/SSD, Hot-swappable, 2x RJ45 Gigabit LAN ports, 5x USB 3.0 Type-A ports, 1x USB 3.0 Type-C port, 2x HDMI v1.4b ports, 1x PCIe 2.0 x2 slot, 2x 3.5mm microphone input jacks, 0.96" monochrome OLED Display, 90W AC Power Adapter.
The TS-453Be features a simple physical design that can easily fit into office and home environments. It provides a PCIe port that can boost its functionality: a QNAP QM2 expansion card can be installed to add M.2 SSD caching/10GbE connectivity and support.