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Door/window sensor set. Magnetic type contact sensor. N ... Read more

Door/window sensor set. Magnetic type contact sensor. Notifies you when your door or window is open. Supervised Sensor: monitors the sensors and their battery condition automatically. GM-318R can work with up to 4 sensors. (additional sensors sold separately) Both audio and visual indicators. Operating range: 300 feet. Easy to set up. FCC/IC approved. One year warranty. WD-318 Includes : One GM-318R Household Alert® Receiver (AC/DC adapter included). One WD-318T Door / Window Sensor (Lithium battery included). Minimize