Sensing Distance : 5 mm
Temperature : 70 Degree Celsius
Body Material : Stainless Steel
Voltage : 30 V
Diameter : M18X1
Switching Function : Normally open (NO), 1 kHZ
Model Name/NumberNID18 5PO

Sensing Distance is 5mm For Flush Mounting Sensing Distance for NOn Flush Mounting is 8mm.
A proximity sensor is a device that detects the presence or absence of an object, or its distance from the sensor, without physical contact. It works by emitting a signal, such as infrared light, electromagnetic field, or ultrasonic waves, and then measuring the response after the signal interacts with an object. Based on the changes in the signal, the sensor can determine whether an object is near, how far away it is, or if it is moving.