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  2. Joy buzzer - Wikipedia

    en.wikipedia.org/wiki/Joy_buzzer

    Joy buzzer. Patent drawing, from Soren Adams's 1932 US patent application. 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 ...

  3. Door phone - Wikipedia

    en.wikipedia.org/wiki/Door_phone

    Door phone. A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside. The device can also lock or unlock the door it has been configured to work with. Door phones have been used across a variety of commercial and residential ...

  4. CIC (Nintendo) - Wikipedia

    en.wikipedia.org/wiki/CIC_(Nintendo)

    CIC (Nintendo) The Checking Integrated Circuit (CIC) is a lockout chip designed by Nintendo for the Nintendo Entertainment System (NES) video game console in 1985; the chip is part of a system known as 10NES, in which a key (which is stored in the game) is used by the lock (stored in the console) to both check if the game is authentic, and if ...

  5. Dead man's switch - Wikipedia

    en.wikipedia.org/wiki/Dead_man's_switch

    Dead man's switch. A pedal acting as a dead man's switch in a bucket lift truck. A dead man's switch is a switch that is designed to be activated or deactivated if the human operator becomes incapacitated, such as through death, loss of consciousness, or being bodily removed from control. Originally applied to switches on a vehicle or machine ...

  6. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control, which has caused permanent hearing damage, having an extremely high decibel capacity (up to 160 dB measured at one meter ...

  7. 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 ...

  8. Panic button - Wikipedia

    en.wikipedia.org/wiki/Panic_button

    A medical alert panic button or medical alarm is an electronic device worn on a bracelet or necklace as part of a medical alert system. When pressed, it sends a wireless signal to a home console which dials alarm monitoring staff and alerts them of an emergency condition. Depending on the severity of the situation, alarm monitoring staff will ...

  9. Buzzer - Wikipedia

    en.wikipedia.org/wiki/Buzzer

    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.

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