There is disclosed a sensor which, when integrated into a dimming system, can turn the dimmer on and off, and vice versa. As an example, lights which are connected to the dimmer can be turned on by using the dimmer, the light level can be adjusted to provide a level of illumination desired by an occupant, and the sensor can turn off the lights when the room is vacant. The sensor here disclosed provides sensing functionality to a dimming system, and the sensors can be remotely controlled by other sensors, dimmers and dimmer remotes.