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  2. Ring (company) - Wikipedia

    en.wikipedia.org/wiki/Ring_(company)

    A second-generation model, Ring Doorbell 2, was released in 2017, with updated hardware and a 1080p camera with improved low-light performance, that does not rely solely on Wi-Fi, unlike the original model. [44] The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message ...

  3. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    These were single-stroke bells: applying current to an electromagnet pulled the bell's clapper against the bell or gong and gave one chime. The bell did not ring continuously, but only with a single ring, until current was applied again. To sustain the tone, these bells were usually much larger than are used today with interrupter bells.

  4. 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]

  5. Bell - Wikipedia

    en.wikipedia.org/wiki/Bell

    This is an iterative process in which metal is removed from certain parts of the bell to change certain harmonics. This process was made possible historically by the use of tuning forks to find sympathetic resonance on specific parts of a bell for the harmonic being tuned, but today electronic strobe tuners are normally used.

  6. Now's a great time to buy the popular Ring video doorbell ...

    www.aol.com/lifestyle/nows-a-great-time-to-buy...

    This Ring Video Doorbell comes with 1080p resolution for a crystal-clear view of your front porch. This model has improved motion detection over previous versions, and you can review video footage ...

  7. File:Ring video doorbell.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Ring_video_doorbell.jpg

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