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NC NO Door Window Contact Magnetic Reed Switch Alarm 3W 10-20mm: Switch Plates: Amazon.com: Industrial & Scientific
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NC NO Door Window Contact Magnetic Reed Switch Alarm 3W 10-20mm: Switch Plates: Amazon.com: Industrial & Scientific
Amazon.com: QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 10 with 40 Screws : Industrial & Scientific