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ESP8266 as Window Sensor with years of battery life - YouTube
ESP8266 as Window Sensor with years of battery life - YouTube
ESP8266 as Window Sensor with years of battery life - YouTube
PIC HSR-0025TSM SMD Reed Switch, T Series Best Deals
Amazon.com: Ymiko Door & Window Sensors, 5pcs MC-38 Recessed Wired Door Window Sensor Magnetic Switch Home Alarm System for Wooden Door, Window : Tools & Home Improvement