Anti sway, dual industrial pyro quad, dual channel MW blah blah blah and they still activate.
Think about it. You've got a device that designed to detect motion in an environment with lots of motion. Yes, outdoor detectors have improved in recent years but they still can't ignore environmental extremes well enough to detect only intruders reliably.
Outdoor detectors usually do one of two things. False alarm with startling regularity or fall asleep because its too hot.
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