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How do burglar alarms work?

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How do burglar alarms work?

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  1. Some work a on circuit. when the circuit is broken an alarm sounds.  Some work on air pressure.


  2. alarms are hard wired to your house. sensors are placed in each door and window. ... If the alarm is on, every time a door or window opens it will go off ..you have several seconds to punch in the off code before it sounds. If the alarm is turned off nothing happens when doors and windows are opened.
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