MC-31 Surface-Mounted Magnetic Door Switch Alarm, White, NC Contact - 5 Pack
$10.99
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5 Pack Surface Mounted NC Magnetic Door Contacts Switch Sensor for Alarm
$12.40
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About this item
It consist of a reed switch part and a magnet part. When door closed, reed switch is effected by magnet and turn ON; when door open, reed switch is effected by magnet and turn OFF, trigger alarm. Sensor Technology Magnetic.
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