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QWORK Wired Alarm Magnetic Garage Door Contact Switch Sensor, Home Security Wired Contact Magnetic Reed Switch Alarm with Adjustable Bracket
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5Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light (Black-B31)
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Amazon.com: Reed Switch and Magnet Assembly : Industrial & Scientific
