Normally Open Magnetic Door Reed Switch Sensor with Magnet - Electronic Components Parts Shop Sri Lanka
Wholesale 12V 24V Magnetic Recessed Wired Door Contact Reed Switch From m.alibaba.com
AMS Roller Door Reed Switch 24" - NFS
Build a door alarm using a reed switch | WISENSE
Magnetic Door Switch Set - COM-13247 - SparkFun Electronics
5X Magnetic Reed Switch Normally Open Closed NC NO Door Alarm Window Security/Magnetic Door Switch/Magnetic Contact Switch/Reed Switch,to DC 5V. Light (white-m38-5pcs) : Amazon.ca: Industrial & Scientific
How reed switches work (magnetically operated switches)