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Advanced PIR1680 Series Passive Infrared Motion Detectors exemplify NAPCO sensor technologys innovation- increasing dependability without compromising intruder catch sensitivity. For applications where animal/pet immunity is key- the PIR1680PT supports 65lb. (29kg) pet protection within its 45 (13.7m) range. Or- the original model PIR1680- has a 50 (15.2m) range and offers nominal 20lb. (9kg) animal/rodent immunity. Outstanding false alarm rejection in both models is made possible with their advanced microprocessor that has been embedded with a library of valid and false alarm signal signaturesenabling the PIR to differentiate intruders from animals and other traditional false alarm sources. In addition to proven intruder-detection circuitry- these units also feature a built-in temperature sensor at no additional chargeso you can provide traditional security- as well as climate security from heat and/or freeze damages- when HVAC systems fail- before pipes burst or dcor- pets or perishables are ravaged by heat extremes- otherwise left unchecked.