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.
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