silent alarm
Soundless security signal
A silent alarm is a security alert that notifies authorities or monitoring services without producing audible sound at the location.
Bank tellers trigger silent alarms during robberies to summon police without alerting the criminal.
The term extends to any warning system designed to avoid detection: She hit the silent alarm under the counter.
- panic buttonEmergency alert activator
- duress codeCode indicating coercion
- stealthySecretly cautious in movement
- alertWarning or watchfulness
- distress signalAlert requesting urgent aid
non-verbal · warning sign · under the radar · intrusion detection · trip wire · emergency · motion detector · canary in a coal mine · tamper detection · break-in · remote monitoring · security · security guard · property protection · covert · tripped · theft · robbery
- security systemsfirewall, antivirus, security systems, security guard, home security
- 911 dispatch911, 911 center, 911 operator, dispatcher, dispatch center
- security alarmspanic buttons, motion sensors, motion sensor, door sensor, window sensor
- securitysecurity guard, security cameras, security system, lock, safe
- heistsheist, bank job, bank heist, bank robbery, art heist
silent alarmsiren
Wailing alert device
audible alarm · alarm bell · klaxon · warning siren · air raid siren
alarm, silence, silent, silently, alarmed, alarming, silenced, alarms, silencing