Main Features Sealed Optics: The sealed optical chamber prevents dra's and insects from affecting the detector. Uniform Sensitivity Optics:Whether an intruder is directly in front of the sensor or at the edge of a protected area, the custom designed Fresnel lens provides a consistent level of detection—delivering optimal performance no matterWhat the distance. Shorter precision focal lengths mean superior optics and detection. Wall-to-Wall Coverage:Wide and long detection coverage for coverage range protection that exceeds similar products in the market. Superior Detection and False Alarm Immunity: The IS335 motion detector provides superior protection against false alarms without sacrificing catch performance. Pet-friendly Selectivity: Installers can turn pet immunity on or off simply by setting a jumper. When pet immunity is enabled, the detector can distinguish between signals caused by humans while ignoring pets up to 80 lbs. PIR White Light Immunity: A patented black bug guard reduces false alarms by providing 2,000 lux of white light immunity. This helps reduce false alarm problems caused by lights, flashlights or reflective objects. Flexible Mountings: The IS335 motion detector mounts on walls or in corners, with heights from 7 ft - 9 ft (2.1 m - 2.7 m).