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How do motion sensing lights and burglar alarms work?

Author: External Author | | Categories: Burglar Alarm System , Interactive Security System

It is common for stores to have a beam of light crossing the room near the door, and a photosensor on the other side of the ­room. When a customer breaks the beam, the photosensor detects the change in the amount of light and rings a bell.

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Original Article Source Credits:   How Stuff Works ,

Article Written By:  NA

Original Article Posted on:  NA

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