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Seco-Larm E-960-D90Q Twin Photo Beam Detectors with Laser Beam Alignment, 90Ensure the safety of your property by adding this perimeter-style photobeam sensor to your security system. The sensor has a built-in laser beam alignment system that speeds accurate, reliable positioning.Features of Seco-Larm E-960-D90Q Twin Photo Beam Detectors with Laser..