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Amazon.com: DIYmall RCWL-0516 Motion Detection Sensor, Microwave Radar Sensor, Switch Module, for Arduino ESP8266 Nodemcu Wemos, for Raspberry PI, for Human Rat Cat Detector, Detection Distance 5-7m : Electronics
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Microwave Sensor with Arduino for humans and objects detection behind walls, Doppler Radar Sensor - YouTube
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Amazon.com : RCWL-0516 Microwave Doppler Radar Motion Detector Sensor Human Body Induction Module Board 5-7M Detection Distance 4-28V by Envistia Mall : Electronics
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