Synology RackStation RS2421RP+, made for a variety of server roles such as backup, virtualization, file storage, email servers, & domain controllers; sliding rail kit included for effortless server installation. Form Factor: NAS Rack Server Internal File System Format: EXT4, Btrfs Ports: 4 x RJ-45 1GbE LAN Ports (with Link Aggregation / Failover support); 2 x USB 3.2 Ports; 1 x Expansion Port Processor: Ryzen V1500B 4-Core 2.2GH z CPU Memory: 32GB DDR4 ECC SODIMM File Storage: 48TB (12 x 4TB) SATA 3.5" HDDs for High-Capacity Storage Power: Redundant Power Supply Operating System: Synology DSM Software Features: Virtual Machine Manager, Central Management System, Security Advisor, Hyper Backup, Snapshot Replication, Active Backup for VMware, Office, & Windows, Synology Drive, Office, & Chat, Surveillance Station, Collaboration Suite, & many more Comes in a sealed box. Hard drives & memory upgrades included separately NOT installed, installation required.