Wired Surface-Mounted NC Magnetic Door Window Alarm Sensor Reed Switch - 5 sets
$15.99
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3 Sets MC 38 Mount Wired Door Window Sensor Magnetic Reed Switch Recessed Ala...
$12.99
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About this item
3 Sets MC 38 Mount Wired Door Window Sensor Magnetic Reed Switch Recessed Alarm Security System Normally Closed NC. - The reed switch is an electrical switch operated by an applied magnetic field. - Switch Type: NC(normal close type), circuit is connected when magnet is near the switch.
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