diffuse reflection sensor (HGA) OBT300-18GM60-E4-V1 Detection range: 10 to 300 mm, light emitter: LED, illuminant: red, alternating light, signal output: 1 NPN output, short-circuit proof, protected by reverse polarity, open collector, circuit type: the circuit type of the sensor is switchable. The delivery status is: Q-Pin4: NPN output/light switching L/D-On-Pin2: low activity input, connection: M12 x 1, 4-pole, operating voltage: 10 to 30 V DC, ambient temperature : -40 to 60°C (-40 to 140°F)