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.
Regarding the power adapter, please refer to How to Hardwire Your eufy Wired Doorbell without Existing Wires.


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T8200S_EU Declaration of Conformity

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