“Do both sides of window/door sensors require a battery”

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• Omly one side

  Answered by Arie 1 year ago

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• No, there is only one watch style battery located in the larger piece. When not mounted on a steel frame, the batteries seem to last several years,

  Answered by Good 2 years ago

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• No. Just the larger part

  Answered by Luischromebook 2 years ago

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