PROXIMITY SENSOR SWITCH
Categories : Series 4 AC Controller By Light,Sound,Remote ,  Infrared & Frequency Control , 
This is a short-range detector that detects an object in its range by picking a reflected InfraRed signal generated by the on-board IR transmitter. An adjustable 0-10 second timer adds functionality by maintaining a contact for external controls. The same circuit may be used with photo interrupters and mark-sense reflective detectors in materials handling applications.
Technical Specification