SALE 5 Sets Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch NC/N
$45.89$50.99
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SALE 1 Set Magnetic Contact Sensor for Doors & Windows - White Security Alarm
$11.39$11.99
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About this item
NC (Normally Closed) principle: when the magnet is in proximity to the switch, the signal is conductive; when it's far away, the signal disconnects, making it ideal for alarms, LED indicators, and door openers.
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