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Sm-217 Door or Window Magnetic Contact Reed Switch Alarm - China Reed Switch, Alarm | Made-in-China.com
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Normally Open Magnetic Door Reed Switch Sensor with Magnet - Electronic Components Parts Shop Sri Lanka
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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
Magnetic Door Switch Set - COM-13247 - SparkFun Electronics