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Active Infrared 2 Beams Detector with 8 Frequencies for Boundary Protection, 40m Distance Outdoor, Find Details and Price about Photo Beams Detector 2 Beams Detector with 40m from Active Infrared 2 Beams Detector with 8 Frequencies for Boundary Protection, 40m Distance Outdoor - Dongguan Sunlit Security Equipments Co., Ltd.