This quad beam photoelectric sensor offers cutting-edge performance in a compact, weather-resistant design, ideal for both residential and commercial security applications. Utilizing 4-beam simultaneous cut-off detection, it delivers enhanced accuracy, stability, and resistance to false alarms. A built-in optical viewfinder allows for precise beam alignment, while an integrated surge absorption circuit protects the device from lightning-related damage. Perfect for use in schools, office buildings, hospitals, and home perimeters. | Spt | | Outdoor Quad-Beam Photoelectric Sensor for Up to 450 ft. in Black | Best Buy