Doorbell
Signaling device placed near an entry door to a building / From Wikipedia, the free encyclopedia
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This article is about auditory signals for doorways. For the type of computer interrupt, see Interrupt § Doorbell. For The White Stripes song, see My Doorbell.
A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first doorbells were mechanical, activated by pulling a cord connected to a bell, modern doorbells are electric, operated by a pushbutton switch. Modern doorbells often incorporate intercoms and miniature video cameras to increase security.