Side-on IR Detector Unit (Pack of 2) (DVFLDTIRS)

This detector makes detection of locomotives or rolling stock easy and reliable.  Just place the sensor where its invisible light beam will reflect off the object of interest and you're done - no time-consuming or frustrating adjustments!  Based on modern silicon technology, this reflective infrared proximity sensor is tolerant of ambient (background) lighting conditions, be it completely dark or under full lights, with no false triggering.  Combined with cross-track installation, this low-profile sensor solves many of the challenges that plague other optical detector products Once a train or carriage goes in front of the sensor, it reflects infrared the light into an integrated sensor.  This is an all-in-one detector system which does not require separate transmitters and detectors to be mounted at peculiar angles to make it work.  The Detectors stay on as long as they "see" an object. Electrical Connections: It is designed to be used with the Lamplighter® DFL (Dedicated Flasher).