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Wireless motion sensor
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ESP-01 Motion Sensor With Deep Sleep : 5 Steps - Instructables
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Motion Detection Alarm | Battery Powered | 6x AA/LR6 | 85 dB | Detector range: 6 m | Wall | Blue / White
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DA600 Battery Driveway Alarm & 4 x T Receivers|Driveway Alert
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Wireless Motion Sensor Alarm Infrared Alert Magnetic Sensor Door Window Sensor 3 | eBay