Viewsonic VA2231WA, Value Series. Display diagonal: 546.1 mm (21.5 "), Response time: 5 ms, Display brightness: 300 cd/m². VESA mounting interfaces compatibility: 100 x 100 mm, Tilt angle: -5 - 20 °. Power consumption (typical): 40 W, Power consumption (PowerSave): 0.2 W. Width: 513 mm, Depth: 64 mm, Height: 389 mm. Windows operating systems supported: Windows XP/ Vista/7