silent alarm

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.
any visual rather than audible alarm. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
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.
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