SPT 15-947 Outdoor Quad-Beam Photoelectric Sensor for Up to 450 ft. in Black

This quad beam photoelectric sensor provides the most advanced features in attractive, compact and weather resistant design. Features4 beam simultaneous cut-off detection provides greater stability and flexibility. It comes with a built-in viewfinders for optical axis adjustment and surge absorb circuit prevents the sensor from damaging by thunder. It is great for security system in school, office building, hospital, home yard, etc. Dual Voltage. Power supply not included.