Synology DiskStation DS620slim, made for a variety of server roles such as backup, file storage, email servers, and domain controllers! Form Factor: NAS Tower Server Internal File System Format: EXT4, Btrfs Ports: 2 x RJ-45 1GbE LAN Port (with Link Aggregation / Failover support); 2 x USB 3.0 Port; Btrf File System for Advanced LUN iSCSI Service Processor: Intel Celeron J3355 Dual-Core 2.0GHz 2MB CPU, Up To 2.5GHz Turbo Memory: 6GB DDR3L Synology SDRAM Memory Storage: 4TB (4 x 1TB) SATA III Solid State Drives for Ultra Fast Storage Power: Single Power Supply Operating System: Synology DSM Software Operating System Features: File Access, Sharing and Sync Data Backup with Deduplication and Compression Capabilities Synology Drive, MailPlus, Chat, Calendar, Office, and Note Station Multimedia Management iSCSI Target Role Synology Directory Domain Controller Role Centralized Management System for Managing Multiple Synology NAS Devices NAS chassis comes in a sealed box Hard drives and memory upgrades included separately NOT installed, installation required