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Amazon.com: CQRobot Ocean: 10.525GHz Doppler Effect Microwave Motion Sensor Compatible with Raspberry Pi and Arduino Board. for Industrial, Measurement, Automatic Doors, Sensor Lights, Reversing Radar, etc. : Industrial & Scientific
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Microwave Sensor Module Doppler Radar Motion Detector Arduino (HW-M09) - China Motion Sensor Module and Microwave Module
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