Zyxel Personal Cloud Storage Server [4-Bay] with Remote Access and Media Streaming [NAS540] Supports four 2.5" or 3.5" SATA III hard disks with 24 TB's max (6 TB x 4) Hot swappable HDD support Two Gigabit Ethernet RJ-45 connectors Three USB 3.0 ports One touch copy / sync button Includes NAS storage device, power adaptor, Ethernet cable and quick start guide