uxcell DC6-36V 300mA NPN NO 3-Wire 4mm Tubular Inductive Proximity Sensor Switch LJ12A3-4-Z-BX
It is a component widely used in automatic control industry for detecting, controlling, and noncontact switching. When proximity switch is close to some target object, it will send out control signal.It's widely used in machine, paper making, light industry for limiting station, orientation taking count, speeding trial ect.