ASUS VE228H. Display diagonal: 54.61 cm (21.5"), Response time: 5 ms, Display brightness: 250 cd/m. Headphone connectivity: 3.5 mm. RMS rated power: 2W. Colour of product: Black. Cable lock slot: Kensington, VESA mounting interfaces compatibility: 100 x 100 mm, LED indicators: Power, Stand-by