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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.
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 ...
The "Wave Radio II" was introduced in 2005 and was based on the Wave Music System without the CD player. It used a dual tapered waveguide and revised speakers. The "Wave Radio III", introduced in 2007, was identical in appearance to the Wave Radio II and added Radio Data System (RDS) and a large snooze button on top of the unit.
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From NFPA 72, 2002 Edition: “7.4.2.1* To ensure that audible public mode signals are clearly heard, unless otherwise permitted by 7.4.2.2 through 7.4.2.5, they shall have a sound level at least 15 dB above the average ambient sound level or 5 dB above the maximum sound level having a duration of at least 60 seconds, whichever is greater ...
On 9 May 2014, Mauro Grange and Charlie Randall, president of McIntosh Laboratory, Inc., announced their plans for a management buyout of Fine Sounds Group in partnership with LBO France and Yarpa, including a relocation of the Headquarters from Milan to New York. [8] On 10 August 2016, Fine Sounds Group was officially renamed McIntosh Group. [9]
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 ...
A buzzer is often constructed by running string through two of the holes on a large button and is a common and easily made toy. A buzzer (buzz, bullroarer, button-on-a-string) is an ancient mechanical device used for ceremonial purposes and as a toy. It is constructed by centering an object at the midpoint of a cord or thong and winding the ...