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silent alarm

noun
1.
an alarm that alerts security personnel or the police without the knowledge of the intruder or criminal whose presence triggers it:
The silent alarm set off a flashing light at the police station.
2.
any visual rather than audible alarm.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for silent alarm
  • He has engineered mice with in-built silent alarm clocks.
  • Use open-mike radio, silent alarm, flashing overhead lights.
  • Try to inform the robber of any surprise other than tripping the silent alarm.
  • The system must transmit a silent alarm when triggered.
  • The teller emptied her drawer into the bag, including marked bait money, and tripped the silent alarm.
  • Thereafter, she reached under the counter and pushed the button to activate a silent alarm.
  • Bank employees activated a silent alarm and police officers arrived on the scene.
  • Alarms used for concealed application requires silent alarm notification to a monitoring station.
  • One day she responded to a silent alarm at a local bank.
  • Holdup alarm means a silent alarm signal generated by the manual activation of a device intended to signal a robbery in progress.

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