“1.Why des this work using an existing 24v power from transformer without a separate lithium battery? 2. Will this work with an existing installed chime system?”

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• Yes, you’ve just gotta make up a joint with the corresponding wires. Then you don’t have to use the batteries.

  Answered by DeezNutz 2 years ago

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• Yes to both and you can cross wires on most teansformers to change voltage

  Answered by GeorgeTA 2 years ago

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