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Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Rolling Door Contact Magnetic Reed Switch Alarm Wireless Wired Door Contact Magnetic Sensor Detector for Rolling Gate Home Security System : Electronics
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106-091 NESS RR3 MICRO RADIO REED SWITCH
Make Your Own Reed Switches | Hackaday
2pcs/1pair 31b Magnetic Reed Switch Nc No Combined Door Contact Sensor Wireless Security Switches - Window Door Sensor - AliExpress
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