Abstract: An alarm system indicates unauthorized use or entry of a facility having an access arrangement and a source of electric potential. The alarm system comprises an alarm device and a first sensing circuit coupled in series with the alarm device and the potential source. The first sensing circuit is sensitive to breaking or entering or other unauthorized use of the access arrangement. A delay circuit is coupled in series with the alarm device and the potential source. The delay circuit normally completes a circuit path therethrough between the alarm device and the potential source but is effective when triggered to interrupt this circuit path for a predetermined interval sufficient to permit authorized entry or use of the access arrangement.