How To Make A Portable Motion Detecting Alarm(PIR)

Learn how to make a super compact, very loud, passive infrared(PIR) motion alarm. This alarm has up to a 30 foot detection range, and only draws 20-25ma from a 9V battery. Ideal for all indoor uses, or outdoor before sunrise or after sundown. This video shows exactly what you need, how to put it together, and you'll also see a demonstration. Enjoy!

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