STBTECH E3Z-R61 Light Barrier Sensor Indoor Wall Mounting NPN (NO or NC Switchable) Reflective Light Barrier Mirror Reflection Proximity Switch with 2 m Cable, Reflector Plate, 2 m Induction Distance

Description Explanation on the definition of NO, NC, NPN, PNP: NO(Normally open): the circuit is open when there is no detection object, and the circuit will be closed after the object is detected NC ...