What Is A Pir Motion Sensor - Camtraptions PIR Manual

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What is a PIR Motion Sensor?
All objects emit heat energy in the form of invisible infrared radiation. A
passive infrared (PIR) motion sensor detects changes in the amount of
infrared radiation in its field of view. This allows it to sense when an animal
passes in front of it.
The term "passive" refers to the fact that the sensor does not emit radiation;
instead it just detects infrared radiation landing on it. As a result, PIR sensors
are extremely energy-efficient.
Camtraptions PIR Motion Sensor Manual Page 3