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The Door / Window Sensor is a battery powered reed sensor that expands the capabilities of the system by monitoring the state of doors, windows, garages and other apertures. The sensor can be used to automatically turn a light on when you enter a room, guard against unauthorised access, warn you if you leave your front door open when you leave the house or even reduce your heating bills by excluding zones with open windows from the heating programme. The Door/Window sensor includes support for an optional temperature sensor.