![Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-learn.adafruit.com/guides/images/000/000/170/medium640/image_2.jpeg)
Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
![Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://img.youtube.com/vi/iUeuy0DUqLw/hqdefault.jpg)
Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
![Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/413x309/5412-02.jpg)
Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
![Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-blog.adafruit.com/uploads/2021/06/I375-01.jpg)
Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
![Amazon.com: 10Sets MC 38 Magnetic Reed Switch NC Mount Wired Door Window Sensor Recessed Alarm Security System Normally Closed, White : Electronics Amazon.com: 10Sets MC 38 Magnetic Reed Switch NC Mount Wired Door Window Sensor Recessed Alarm Security System Normally Closed, White : Electronics](https://m.media-amazon.com/images/I/41CPmzl0ZkL._AC_.jpg)
Amazon.com: 10Sets MC 38 Magnetic Reed Switch NC Mount Wired Door Window Sensor Recessed Alarm Security System Normally Closed, White : Electronics
![Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/1200x900/189-00.jpg)