Bosch Wireless TriTech Detector, Radion RFDL-11Pet Immunity: Highly effective for pets up to 45 kg (100 lbs). It can distinguish between a human and a large dog, or multiple smaller animals. Dual Technology: It requires both the PIR and the Microwave sensors to trigger simultaneously to generate an alarm, which virtually eliminates false alarms from environmental factors like moving curtains or temperature changes. Battery Life: Operational for up to 5 years using four user replaceable AA Alkaline