An internally fitted pet alley mask helps solve the problem of pets inadvertently activating the alarm. The integral swivel bracket simplifies installation and offers added flexibility. Contemporary design that looks good in the home or the office. Durable, elegant high-gloss housing with an integral swivel bracket for ceiling and wall mounting. Unique clip-on pet pattern mask. Adjustable 1, 2 and 3-pulse counter virtually eliminates false alarms. Sealed optical chamber protects sensor from insects and air currents. Temperature compensation for optimum catch performance and false alarm protection. 30 V/m advanced RF protection up to 1 GHz Detection Pattern: 90° wide-angle lens, with 36 beams in 3 detection layers. Adjustment: 3-position vertical adjustment scale.