This high performance NAS (Network Attached Storage) allows you to have media safely in one place and access them from anywhere. With My Cloud EX2 Ultra allows you to automatically synchronize your computers can share files and folders, and use multiple backup options. Seamlessly and you create your own customized system. Interface Gigabit Ethernet 1 ? power supply (DC. Input) 2 x rear expansion port USB 3.0 CPU 1,3GHz dual-core processor Marvell ARMADA? 385 Memory DDR3, 1 GB, Drive bays 2 slots for 3.5 “hard drives, swappable, without compartments Internal hard drives WD Red: 4TB (2 x 2TB) expansion ports 2 USB 3.0 ports System Requirements Operating system Windows 10, Windows 8 or Windows 7 Mac OS X El Capitan, Yosemite, Mavericks, Mountain Lion or Lion Device streaming DLNA/UPnP Router with Internet access network protocols DHCP client or static IP address NTP client Dynamic DNS (DDNS) Apple Bonjour and Windows Rally Support for jumbo frames up to 9000 VLAN (802.1Q) Link aggregation and failover for 2 Gigabit Ethernet ports UPnP port forwarding LLTD (Link Layer Topology Discovery) iSCSI SSH backup Management Remote Backup: My Cloud Expert series to series My Cloud Expert locally or remotely Backup internal files or folders on the device to other files and folders on the NAS device or a connected USB drive WD SmartWare for Windows clients Support for the Apple Time Machine (version 10.5.8 and later) Cloud backup services Amazon S3 ElephantDrive (http://home.elephantdrive.com/) Managing synchronization disk connected to USB ports disk Management RAID: JBOD, Spanning, Field 0/1 Migrating RAID: JBOD to a RAID 1 Swapping Move disks Moving fields Security Volume encryption (256-bit AES) Package contents NAS Ethernet cable power Quick Installation Guide More on the manufacturer website: http://www.wdc.com/en/products/products.aspx?id=1650#Tab3