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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for What triggers some alarms:

INTRUDER: Alarm triggerer
TRIPWIRE: Security alarm trigger
MOTION: What triggers some alarms
SENSOR: One might trigger an alarm
SENSOR: It might trigger an alarm
TRIP: Trigger, as an alarm
SETOFF: Trigger, as an alarm
SMOKE: Trigger for some alarms