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  2. Smart doorbell - Wikipedia

    en.wikipedia.org/wiki/Smart_doorbell

    A smart doorbell is an internet-connected doorbell that notifies the home owner on his or her device (smartphone or any other gadget) when a visitor arrives at the door. It activates when the visitor presses the button of the doorbell, or alternatively, when the doorbell senses a visitor with its built-in motion sensors .

  3. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    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 ...

  4. 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 ...

  5. Best video doorbell of 2023 - AOL

    www.aol.com/lifestyle/ding-dong-best-video...

    Although it's one of the more expensive video doorbells at $260, the Eufy Video Doorbell Dual doesn't hit you up with fees or subscriptions. If you want maximum video coverage of your porch area ...

  6. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    This had previously been used, mechanically actuated, for servant-call bells in large houses. Instead of working a clapper, the electromagnet shook the whole bell, which was mounted on a flexible spiral spring. The inertia of the heavy bell on the light spring would continue ringing for some seconds after the stroke.

  7. Tennis For Two was, to say the least, a very basic game. There was a tennis court represented by just two lines: one being the ground, the other being the net. The ball was a mere dot that bounced ...

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