Synology RackStation RS820RP+ is a compact and scalable 4-bay rackmount NAS and is an ideal choice for remote office or small business with limited office space; sliding rail kit is included for easy server installation Atom C3538 4-Core 2.1GHz CPU; 18GB DDR4 non-ECC Memory; 4TB (4 x 1TB) SATA 2.5' SSDs for Ultra-Fast Storage; 4 x RJ-45 1GbE LAN Ports (with Link Aggregation / Failover support); 2 x USB 3.2 Ports; 1 x eSATA Port; Redundant Power; Btrfs File System for Advanced LUN iSCSI Service Features: Easy to use Synology DSM Operating System, desktop-like layout, iSCSI Target, Backup with Snapshot Replication Technology Support, Near Unlimited File Management and Sharing, Digital Asset Protection, Comprehensive Built-In Security Tools, Redundant Power, and Storage Virtualization Solution Compatibility Synology NAS chassis comes in a sealed box. Hard drives and memory upgrades included separately, NOT installed, installation required.