Which type of alarm is designed to signal a silent warning without alerting potential intruders?

The silent alarm is specifically designed to signal a warning discreetly without alerting potential intruders. This type of alarm is often employed in situations where a quick, covert alert is necessary, such as in banks or during a home invasion, where it’s critical to avoid escalating the situation and to alert authorities without drawing attention. Silent alarms can be activated by pressing a hidden button or through other discreet means, allowing law enforcement to respond while the intruder remains unaware of the alert being sent.

In contrast, audible alarms create a loud noise to deter intruders and alert people nearby, while visual alarms use lights to signal distress, both of which would make the situation obvious to the intruders. Duress alarms are specifically triggered in situations where the individual is under threat and signifies danger but might not always operate silently. In this context, the silent alarm stands out as the most effective option for covertly signaling an alert.