signaling device placed near an entry door to a building
A doorbell is a device which is typically installed to or near a door. When a visitor presses a button, the bell rings inside the building, alerting the presence of the visitor.
In modern technology, a button is pressed completing a circuit which in response makes a sound.
Older doorbells were fully mechanical. Newer electrical doorbells were installed by wires and use a push-button to activate the sound. The latest doorbells have wireless connections although older ones may be wired.
- ↑ email@example.com (2015-11-18). "The History of the Doorbell: Who Invented It? Find Out!". 1800doorbell. Retrieved 2022-12-31.
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