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The wired Nest 3rd gen Doorbell can be powered from the lower voltage (appx 24vac) transformers in the original standard doorbell.
Sorry, there was a problem. Please try again later.Hey there, John. The Nest Doorbell (Wired, 3rd Gen) uses 16 to 24 V AC. Here’s a link with more information on compatibility: https://support.google.com/googlenest/answer/9247132
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