Doorbell facts for kids
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.
History
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.
Images for kids
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Old door bell pull knobs in Edinburgh, United Kingdom. It is unclear whether bells were running by wire and pullies, or by electrical connection.
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Doorbell Facts for Kids. Kiddle Encyclopedia.