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The contact sensor is what is attached to the doors or windows. Essentially it's like a magnet that when it's apart, the alarm will activate. They are battery powered (I think they last about 5 years, and it's a simple watch battery). They have a strong double sided tape that sticks to the door, and the frame, or window and frame
Sorry, there was a problem. Please try again later.A contact sensor is a window or door sensor that will alert you when window or door is open.
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