How to Build a Laser Security System YouTube

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TITLE:	How to Build a Laser Security System YouTube
VIDEO URL:	http://www.youtube.com/watch?v=zQK1kTh57Fk
THUMBNAIL:	http://i.ytimg.com/vi/zQK1kTh57Fk/hqdefault.jpg
VIDEO ID:	zQK1kTh57Fk