You don't have to sacrifice the security of your home because you own pets. With most ordinary motion detectors, a dog or cat can easy trip the sensor and cause a false alarm. With most cities cracking down on residential false alarms, you could face stiff fines, or be put on a do not respond list by local law enforcement.It Won't Confuse Your Pets for BurglarsThe Slimline Pet Immune PIR Motion Detector is an updated version of a motion sensor we've sold for years. This new model contains an advanced pet immune PIR detector element and lens system. Using TSITM (Target Specific Imaging) technology, the detector ensures immunity to pets weighing up to 40 pounds (18 kg).Reliable OperationThe detector is also notable for its high stability, enhanced RFI protection (greater than 30 V/m), and high-temperature compensation for maximum catch performance and unique low-temperature compensation for optimum false-alarm rejection. The pyroelectric sensor is enclosed in a sealed chamber, protected from insects and air drafts. more info