A:Answer Hi jw1848h.
Good question. The Ring Video Doorbell 4 is powered by a rechargeable, quick-release battery pack. It can be hardwired to an existing doorbell system or transformer with 8–24 VAC, 40 VA max, and 50–60 Hz for continuous charging. Physically installing your Ring Video Doorbell 4 Plus with an existing doorbell is a simple process. Visit our support center for a step-by-step guide.
We invite you to reach out to our Community if any additional information is needed regarding your question. The Ring Community is our first peer-to-peer community forum, giving our customers the ability to help one another by sharing their feedback and experiences with each other.
All the best,
Nicole from Ring.