An alarm system that uses a sound- or light-generating device, such as a bell or strobe lights, located on the exterior wall of the protective area to call attention to a violation is known as a(n):

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A local alarm is designed to alert those within the protected area of a violation, and typically uses a sound or light-generating device located on the exterior wall of the protected area. Intruder alarms, direct alarms, proprietary alarms, and central station alarms may all use similar methods of alerting authorities, but they typically involve communication with monitoring centers or other remote locations, rather than localized alerts.

An Alarm System That Uses a Sound- or Light-Generating Device