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Does the wired doorbell require existing doorbell wiring?
Not exactly. You can have the existing wires for power. Besides, you can also charge the wired doorbell via a power adapter. For eufy wired doorbell, it needs a 16-24V 30VA or above transformer to work.

Regarding the power adapter, please refer to How to Hardwire Your eufy Wired Doorbell without Existing Wires.
Does the wired doorbell require existing doorbell wiring?
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Video Doorbell 2K (Wired)Video Doorbell 2K (Wired)
Video Doorbell 1080p (Wired)Video Doorbell 1080p (Wired)
Video Doorbell 2K Pro (Wired)Video Doorbell 2K Pro (Wired)
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