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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. 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 ...

  4. Sony Dream Machine - Wikipedia

    en.wikipedia.org/wiki/Sony_Dream_Machine

    A clock radio that has a different alarm sound and has a volume control and two different alarms. This one comes in the MK2 version as well, It has a red LED display, and for the MK2, it has a green LED display. The first alarm is a radio alarm and the second one is the buzzer, Two bands; FM and AM.

  5. The best smart speakers for seniors in 2023 - AOL

    www.aol.com/lifestyle/best-smart-home-speakers...

    But app and button gripes aside, the Nest Audio works very well overall and delivers a robust smart-speaker experience. If you want a more affordable option, the Google Mini costs just $49 .

  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. Joy buzzer - Wikipedia

    en.wikipedia.org/wiki/Joy_buzzer

    A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled mainspring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration that mimics an electric shock to the unsuspecting victim.

  8. Experts say panic buttons can enhance school safety, but only ...

    www.aol.com/experts-panic-buttons-enhance-school...

    The school district, which serves more than 251,000 students, adopted a silent panic alarm system in the wake of the February 14, 2018, mass shooting at Marjory Stoneman Douglas High School in ...

  9. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    The standard fire alarm sound used in most of North America. Coding refers to the pattern or tones a notification appliance sounds in and is controlled either by the panel or by setting jumpers or DIP switches on the notification appliances. The majority of audible notification appliances installed prior to 1996 produced a steady sound for ...