Synology DiskStation 4-Bay (Diskless) Network Attached Storage DS413j CPU: 1.6GHz w/ Hardware Encrypted Engine RAM Size: 512MB DDR3 Internal HDD: 4x 3.5" or 2.5" SATA2 Max Internal Capacity: 16TB (4x 4TB HDD) External HDD Interface: 2x USB 2.0 Ports LAN: 1x Gigabit