What kind of alarm is most often used in residential settings to detect unauthorized entry?

An intrusion alarm is primarily designed to detect unauthorized entry into a residential or commercial property. These systems typically use sensors placed on doors and windows or motion detectors throughout the premises. When an unauthorized person attempts to gain access, the sensors trigger an alarm, which serves both as a deterrent to the intruder and alerts the occupants or monitoring services to the potential break-in.

In contrast, environmental alarms are focused on detecting conditions like flooding or temperature changes that may indicate water damage or extreme weather situations. Fire alarms are intended to detect smoke or heat from flames, activating in response to the presence of fire to ensure the safety of inhabitants by facilitating an early evacuation. Medical alert systems are designed for individuals who need immediate assistance due to medical emergencies, allowing them to signal for help with the push of a button.

Thus, while each of these alarms serves a critical role in safety and security, the intrusion alarm is specifically tailored for the detection of unauthorized entry, making it the most suitable choice for residential security against intruders.