Apple Thunderbolt Display 27". Display diagonal: 685.8 mm (27 "), Response time: 12 ms, Display brightness: 375 cd/m². Subwoofer RMS power: 49 W, Audio system: 2.1. Input voltage: 100 - 240 V, Input frequency: 50/60 Hz, Power consumption (typical): 250 W. Width: 650 mm, Depth: 207 mm, Height: 491 mm. Mac operating systems supported: Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion