Panasonic sw 101 optical touch switch photoelectric sensor panasonic sw 101 this optical touch switch uses a photoelectric sensor to produce an ergonomic actuator suitable for a wide variety of applications the switch is simply operated by touch interrupting the two beam axes light beams and the overall design and performance of the sensor ensures that there are no false actuations due to dirt dust foreign objects accidental droppages etc br br there are three output modes giv