silent alarms
Soundless security signals
A silent alarm is a security system that alerts authorities or monitoring services without producing audible sound at the location.
Unlike conventional alarms meant to scare off intruders, silent alarms avoid tipping them off, giving police time to arrive: The bank teller triggered the silent alarm during the robbery.
The phrase extends to any covert warning system.
- panic buttonsEmergency activation controls
- bank heistTheft from financial institution
- quietLacking in sound
- discreetCareful to avoid notice
- emergencySerious sudden danger
armed response · alert · warning · stealthy · intrusion · surveillance · tamper detection · security breach · signal · real-time monitoring · whisper · mute · banks · jewelry store · hush · security systems · notification · motion sensors
- security systemsfirewall, antivirus, security systems, security guard, home security
- securitysecurity guard, security cameras, security system, lock, safe
silent alarmssirens
Emergency vehicle noisemakers
klaxons · air raid sirens · fire alarms · car alarms · burglar alarms
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