The package is complete: - Synology device - Key - Adapter - 2 SEAGATE hard drives with 4TB capacity, 7200 RPM Specifications: Integrated and powerful two-way NAS network: Ideal for home and small office environments that need centralized data storage, media streaming, and private cloud access. High-performance quad-core processor: Ensures smooth multitasking, fast file transfers, and responsive performance for multiple users. Sequential read/write speeds up to 276/224 MB/s support stable data transfer Add 5 additional drive bays with storage capacity up to 140TB with a single DX525 expansion unit Benefit from integrated file and photo management solutions, data protection, and surveillance.