👉 Prealarm is a type of alarm system that operates before an actual event occurs, often in response to a potential threat or emergency situation. This means that the alarm system is activated automatically and does not require any human intervention for its operation. In the context of security systems, prealarms can be used as a preventative measure to alert individuals about potential threats, such as intruders or natural disasters like earthquakes. They are often set up in combination with other security measures such as alarms, cameras,
