A burglar alarm is an electric device that makes a bell ring loudly if someone tries to enter a building by force. a piece of equipment that makes a loud noise when someone tries to get into a building illegally
a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"
electronic device that makes a loud noise and warns of forced entry (when a window or door is opened or tampered with as by a burglar); loud warning sound produced by a burglar alarm
a warning device that is tripped off by the occurrence of a burglary a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away