Wired Door & Window Alarm Contacts Frequently Asked Questions

How Do I Replace Wired Door Alarm Sensors?
If you are replacing a wired door alarm sensor, you can just disconnect the wires from the old sensor and connect them to the new one. Learn how to replace wired door sensors.
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How Do I Remove an Alarm Sensor from My Door?
Alarm door sensors are very easy to remove. You just have to delete the zone programming, disconnect the wires and remove the sensor and magnet. Learn to remove door sensors.
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How Do I Remove an Alarm Sensor from a Door or Window?
Many users will want to remove an alarm sensor from a door or window to use it in a new location. This process is fairly easy. Find out how to remove door and window contacts.
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Are Door and Window Contacts Tamper Proof?
Most door and window contacts have protections put in place to prevent intruders or other people from tampering with them. Find out how door and window contacts are tamper proof.
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Where Can I Buy Door Contacts for My Alarm System?
Alarm Grid sells all the door contacts you need for your alarm system. We offer hardwired and wireless contacts in surface-mount and recessed varieties. Learn about door contacts.
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Do Alarm System Door Contacts Need a Power Supply?
Door contacts operate using a built-in reed switch and magnet. No power supply is needed. But wireless contacts use power to communicate with the panel. Learn about door contacts.
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Where Do I Install a Sensor Contact on a Door?
The best place to install a contact is on a door frame. The magnet should be installed on the moving part of the door, within a half-inch of the sensor. Learn about door contacts.
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Where Can I Buy Alarm Contacts?
Alarm Grid offers all of the door and window contacts you need for your alarm system. We offer door and window sensors of all types. Learn about our alarm contacts.
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What is a Door Contact Sensor
Alarm systems use door contact sensors to know whether or not doors are opened or closed. This is important for monitoring building activity. Learn about door contacts.
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What Is the Best Wired Security Door/Window Contact?
There are many great wired door and window contacts available. The best one depends on the application. Learn which wired security door and window contact is best for your needs.
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