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.
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Silent alarm is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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Example sentences
Bank employees activated a silent alarm and police officers arrived on the
  scene.
All necessary safety precautions are being taken including a silent alarm
  system.
The system must transmit a silent alarm when triggered.
He has engineered mice with in-built silent alarm clocks.
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