WD 4TB My Cloud Mirror (Gen 2) + 2-bay Personal Cloud Storage - NAS Network Attached Storage WDBWVZ0040JWT-NESN Operating System: Windows 10, Windows 8, Windows 7, or Windows Vista operating systems Mac OS X Yosemite, Mavericks, Mountain Lion or Lion operating systems Interface: Gigabit Ethernet 2 x USB 3.0 expansion ports Port RJ-45: 1 x 10/100/1000M Port USB: 2 x USB3.0 Temperature: 5°C - 35 °C Dimensions: 6.75 x 3.90 x 6.10 Weight: 3.40 lbs. Package Contents: Personal cloud storage Ethernet cable AC adapter Quick Install Guide