“How do the sensors work, Is there a battery in them and how long does the battery in the sensor work? Do you get notifications of low battery power in the sensor's also?”

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• There is a small battery and mine have lasted over 2 years without needing to be replaced.

  Answered by DarkoA 4 years ago

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• They do have a battery, a long life photo battery I believe a cr123, like a fat short AA. they should last about 2 years.

  Answered by superbuffundo 5 years ago

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• Nest Detect can detect motion and when windows and doors open or close. It can even tell when it’s being tampered with. It uses a battery that can last up to two years, and the Nest app tells you it’s getting low. It’s important to replace it promptly with a new Panasonic CR123 or Energizer CR123A lithium battery.

  Answered by Nest Support 5 years ago

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