Some models include an occupancy override push button on the left side of the network sensor, inline with the green LED. If the green LED is illuminated, the network sensor is in the occupancy override mode. If the green LED is not illuminated, pressing the occupancy override push button activates the normal-working-hours comfort mode.
Some NS-series sensor models also include a PIR Occupancy Sensor, or can initiate occupancy by rotating the setpoint dial. The LED is not illuminated when the PIR sense occupancy or the setpoint dial is rotated.