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What type of batteries do door and motion sensors use?

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Nest Secure: A Nest Detect sensor (which combines door/window/motion detection) includes one replaceable CR123 3V lithium battery, with battery life of up to 2 years.

 

Smart Security Systems: Door sensors take a single 3V lithium watch battery, while motion sensors take two lithium AA batteries. Both types of battery last 5 to 10 years.

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