The ideal of intrusion detectors should only be triggered when detect the human (intruder), it should not be triggered when detect the movement of dogs, cats and mouse, as well as changes of environment of temperature, humidity, wind, or raining or sounds…etc. To achieve this purpose is not easy; most of device not only can be triggered by the movement of human, but also triggered by other factors.

What is a false alarm?

A false alarm is any alarm caused by human error or equipment problems resulting in police response, with no evidence of an actual crime having been committed.