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DIY Hacks & How To's: Laser Tripwire
security
security
Laser Trip Wire Security System With Combination Lock and Epic Siren! : 12 Steps (with Pictures) - Instructables
SpyNet Laser Trip Wire from ThinkGeek
DIY Portable Laser Tripwire!
Laser Tripwire Alarm : 9 Steps (with Pictures) - Instructables
SpyNet Laser Trip Wire protects your priceless artifacts or sandwiches, more likely
SpyNet Laser Trip Wire
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SpyNet Laser Trip Wire from ThinkGeek