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  2. A magnetic contact is a door and window sensor that functions using an internal reed switch in conjunction with a magnet. This is the most common way for a door and window sensor to operate. These devices are known for being particularly easy to use and enroll with security systems.
    www.alarmgrid.com/faq/what-is-a-magnetic-contact
    A door contact sensor works using a sensor and a magnet. The sensor has an internal reed switch that is closed when it is in direct proximity with a magnet. When the door is opened, the magnet is separated from the sensor. This releases the reed switch, and the sensor alerts the panel.
    www.alarmgrid.com/faq/how-does-a-door-contact-…
    MAGNETIC DOOR CONTACT SENSOR Magnetic contact is used to detect opening of door, gate or windows in the event of intrusion. Generally in comes in two components. They are installed at upper and lower opening gap of the door.
    magnet.com.my/burglar-alarm/detector-sensor/ma…
     
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  4. Door Alarms | Alarms & Sensors - Screwfix

     
  5. Magnetic Door Contact for sale - eBay

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