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  2. Smart doorbell - Wikipedia

    en.wikipedia.org/wiki/Smart_doorbell

    The smart doorbell lets the home owner use a smartphone app to watch and talk with the visitor by using the doorbell's built-in high-definition infrared camera and microphone. They can be either battery operated or wired. [1] Some smart doorbells also allow the user to open the door remotely using a smart lock. [2]

  3. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

  4. Button cell - Wikipedia

    en.wikipedia.org/wiki/Button_cell

    Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.

  5. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    Older electric doorbell. An electric bell is a mechanical or electronic bell that functions by means of an electromagnet.When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.

  6. Oxford Electric Bell - Wikipedia

    en.wikipedia.org/wiki/Oxford_Electric_Bell

    The experiment consists of two brass bells, each positioned beneath a dry pile (a form of battery), the pair of piles connected in series, giving the bells opposite electric charges. The clapper is a metal sphere approximately 4 mm (3 ⁄ 16 in) in diameter suspended between the piles, which rings the bells alternately due to electrostatic ...

  7. Argos - Wikipedia

    en.wikipedia.org/wiki/Argos

    Argos (dog), Odysseus' dog in the Odyssey; Argos (radio program), a Dutch documentary series; Eddie Argos (born 1979), English musician; Argos-Shimano, a former cycling team; Task Force Argos, a branch of the Queensland Police Service; Toronto Argonauts or Argos, a Canadian Football League team; Minister Argos, a villain from the manga and ...

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