SMB NAS 4 HDD trays, rackmount 1U, 2 PSU. 4-core Intel Celeron N5105/N5095 2.0-2.9 GHz, 8 GB RAM MAX, 2x2.5 Gigabit Ethernet, 4xUSB, 1xHDMI . PCIe Gen 3 x2 , W/o rail kit RAIL-B02