5 Sets Flush Mounted 3/4″ Door Magnetic Contacts Alarm Switch Sensor NC Type (Black)
$6.99
- 3/4″ standard mounting diameter with self-locking clip
- White/black color for choosing, suitable for dark or light color doors/windows
- Over 1″ long operation distance, suitable for metal doors
- NC type: when door is closed, switch is closed loop, when door is open, switch is open loop
- High quality reed switch&magnet, over 50K times open/close circulation
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