Multi-Frequency Quad Photobeam Detectors, 660 ft. (200m) outdoors, 1320 ft. (400m)indoors, 495 ft. (150m) outdoors, 990 ft. (300m) indoors, 330 ft. (100m) outdoors, 660 ft. (200m) indoors, 165 ft. ( 50m) outdoors, 330 ft. (100m) indoors
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