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Product Information Invisi-Guard™ thru-beam photoelectric sensor is intended to detect the presence of an obstacle when the infrared light beam is interrupted. The system includes two independently housed units: a battery powered infrared emitter and a receiver that wires directly to your controls. The battery emitter saves time and money by eliminating the need to saw concrete or run wire across the opening. The built-in audible low battery alarm alerts users when it is time to replace batteries. Features:
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Price: $129.99