45 ft. Retro-Reflective Photobeam Sensor (Seco-Larm E-936-S45RRGQ) Overview: Introducing our 45 ft. Retro-Reflective Photobeam Sensor, the Seco-Larm E-936-S45RRGQ. This sensor is designed to provide reliable detection and monitoring over long distances, making it ideal for applications that require ..