In intrusion systems, what is the primary role of a horn as a notification device?

The primary role of a horn in intrusion detection systems is to provide audible alerts during an intrusion. This device serves as an active notification mechanism, ensuring that individuals in the vicinity are immediately made aware of a potential security breach. The loud sound emitted by the horn can alert security personnel, deter intruders, and inform people nearby to take necessary actions or evacuate.

Using audible alerts is critical in security environments as it helps to quickly notify multiple people simultaneously, thus improving the response time to threats. While other elements might contribute to the overall functioning of an intrusion detection system, such as visual displays or aesthetic features, the fundamental purpose of the horn centers around auditory signaling to convey urgent information effectively.