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Check the listing for details. DC3-30V RCWL-0513 Microwave Radar Sensor Module Smart Sensor Detector for Lights. Condition: New. Listed at 1.83 USD. Microwave sensing is a new type of dead-zone-free sensing mode based on the Doppler radar principle. Adjustable sensing distance and repeat trigger interval. Arduino Module. Hallway lights, motion-sensing lights, solar lights.