Reolink Keen, Argus, Argus 2.
The PIR sensor detects changes in the amount of infrared radiation impinging upon it, which varies depending on the temperature and surface characteristics of the objects in front of the sensor. When an object, such as a human, passes in front of the background, such as a wall, the temperature at that point in the sensor's field of view will rise from room temperature to body temperature, and then back again.
The sensor converts the resulting change in the incoming infrared radiation into a change in the output voltage, and this triggers the detection. Objects of similar temperature but different surface characteristics may also have a different infrared emission pattern, and thus moving them with respect to the background may trigger the detector as well.
Our cameras, with wide angle and highly sensitive PIR motion sensor, offer almost no false alarms. No human movement can slip through without your notice. You will receive instant app push notifications, email alerts and sound alarms (siren) when motion events are detected.