MAKE A MEME View Large Image Front-Fresnel type.JPG en Front view of typical residential/commercial passive infrared motion detector Photographed and uploaded by me Jack LaRosa 07-26-08 PIR Passive infrared sensor Fresnel lenses Motion detectors
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Keywords: Front-Fresnel type.JPG en Front view of typical residential/commercial passive infrared motion detector Photographed and uploaded by me Jack LaRosa 07-26-08 PIR Passive infrared sensor Fresnel lenses Motion detectors
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