Honeywell IS312B - Compact PIR Motion Sensor with Pet Immunity Designed with the installer in mind, this small form factor motion detector offers a trouble-free, out of the box experience to simplify the install process and reduce install time. With the passive infrared IS312, optimum performance is achieved using custom developed extended range Fresnel optics, look down, cover tamper, and selectable pet immunity up to 36kg. Leading edge sensing technologies and a wide range of models to suit the requirements of most applications and will maximize intruder detection while diminishing false alarms. Features: Sleek, Sturdy Housing Pet friendly Selectivity (36kg) Integrated Screw Retention Features Uniform Sensitivity Optics Wall-to-Wall Coverage Superior Detection and False Alarm Immunity Selectable Look Down PIR White Light Immunity Wall/ceiling bracket supplied