SMB NAS 4 HDD trays, rackmount 1U, 1 PSU. 4-core Intel Celeron N5105/N5095 2.0-2.9 GHz, 8 GB RAM, 2x2.5GbE, 2xUSB 3.2 Gen 2 (10Gbps), 2xUSB 2.0, 1xHDMI, 2xM.2 PCIe Gen 3 x1 slots , W/o rail kit RAIL-B02