doorbell

A bell, buzzer, or chime device mounted on or adjacent to a door's exterior, meant to be rung by a visitor to announce one's presence.

There are, of course, smart speakers (which roughly a quarter of American homes have) and smart thermostats, as well as smart thermometers, smart mattress covers, smart coffee makers, smart doorbells, and even, yes, smart toasters.

To ring many doorbells in an effort to contact people and thereby spread information or solicit.

To ring many doorbells of (target people or an area) in an effort to contact people and thereby spread information or solicit.

We doorbelled the whole district in an effort to get out the vote.