Power Sensor is a built-in people sensor that transmits & receives harmless infrared signals to determine if user is present & automatically reduces monitor brightness when user steps away from the desk, cutting energy costs by up to 80 percent & prolonging monitor life. Effective viewing area: 476.6 (H) x 268.1 (V) Aspect ratio: 16:9 Optimum resolution: 1920 x 1080 @ 60 Hz Response time (typical): 5 ms Brightness: 250 cd/m-square Contrast ratio (typical): 1000:1 Smart Contrast: 20, 000, 000:1 Signal Input: VGA (Analogue), DVI-D (digital, HDCP)