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2. Buzzer - Wikipedia

   en.wikipedia.org/wiki/Buzzer

   A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.

3. Door phone - Wikipedia

   en.wikipedia.org/wiki/Door_phone

   Door phone plates consist of a matrix of buttons. each of them drive a buzzer located in a unit inside each apartment building. Each apartment building contains a button that can activate the electric strike. There are several installation systems, the most traditional being a system known as 4 + 1, named for the types of wiring that it ...

4. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical 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 ...

5. Piezoelectric speaker - Wikipedia

   en.wikipedia.org/wiki/Piezoelectric_speaker

   A piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a "piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and ...

6. Electric bell - Wikipedia

   en.wikipedia.org/wiki/Electric_bell

   An electric buzzer uses a similar mechanism to an interrupter bell, but without the resonant bell. They are quieter than bells, but adequate for a warning tone over a small distance, such as across a desktop. A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric.

7. 6 Electronics Retirees Should Buy From Costco on Black Friday

   www.aol.com/finance/6-electronics-retirees-buy...

   From Nov. 18 to Dec. 2, you can purchase an 8-piece Ring Alarm home security system for $119.99. This is $80 off the regular price. ... motion detector, panic button and three contact sensors ...