Before installing a wired smart doorbell, check that the existing doorbell transformer provides 16 or 24 volts AC and 10 to 40 volt-amperes. Confirm that a compatible wired chime is installed, since the transformer and chime may require replacement if they do not meet these requirements.

Google doorbells can send visitor announcements to compatible smart-home speakers and show a live camera feed on supported displays, so users can see or hear who is at the door. Through a compatible mobile app, users can view live video, review event history, receive activity alerts, and manage settings remotely.

Compare video resolution, field of view, low-light detail, and digital zoom to see how clearly each doorbell captures visitors and activity. Also review alert types, such as notifications for people, packages, animals, and vehicles, along with activity zones and event-history options, which may range from up to three hours of free history to longer storage with a subscription.

Google doorbells can be installed outdoors or indoors, depending on the model and the monitoring needs of the space. For outdoor installations, consider exposure to rain, wind, snow, temperature changes, and available wiring, while wired models may require a compatible transformer and chime.