He didn't trip a burglar alarm until he was leaving the factory, but the Degravitational Unit made his escape easy.
With the safe in this room I looked upon them as a burglar alarm.
Their faith in Harriet Burrells burglar alarm permitted them to sleep without fear.
But who would think of putting a burglar alarm on an air-duct?
Then she remembered for a certainty the fast bolted doors and the burglar alarm, and then her blood ran cold with fear.
True, the burglar alarm had given notice of the presence of the men, but Tom and Ned had not acted quite quickly enough.
The system of burglar alarm installed in the mansion was an elaborate one but he was not unskilled in matters of this sort.
"Now I guess they see what use the burglar alarm is," Tom found a chance to whisper to Harry.
The burglars walked in one night and carried off the burglar alarm!
It must have been about midnight when they were both awakened by hearing the burglar alarm go off.