These sensors work too well! We have two sitting on the porch, and our patio is empty. These things go all the time! This thing either sees ghosts or is summoned by the shadows of moving trees 20 feet away. But they make a loud siren sound, blink and say "Warning, restricted area!"! I only gave them 4 stars because they will fire if nothing is checked. I've had several fears painting my patio on a cool summer evening with the porch light on and it STILL goes off! Like I said, it works too well!
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