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The Panic button

popart_panic_button_teaser

panic alarm is an electronic device designed to assist in alerting somebody in emergency situations where a threat to persons or property exists.

A panic alarm is frequently but not always controlled by a concealed panic alarm button. These buttons can be connected to a monitoring center or locally via a silent alarm or an audible bell/siren. The alarm can be used to request emergency assistance from local securitypolice or emergency services. Some systems can also activate closed-circuit television to record or assess the event.[1]

Many panic alarm buttons lock on when pressed, and require a key to reset them.

Read more here…

https://en.wikipedia.org/wiki/Panic_button