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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. Best video doorbell of 2023 - AOL

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

   This is the doorbell that's been on my house for well over a year, and for the most part, I've found it a solid addition. A hardwired option, it replaced my existing bell and came with a plug-in ...

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. Google Nest - Wikipedia

   en.wikipedia.org/wiki/Google_Nest

   In 2021, Google announced the battery-powered Nest Doorbell, while the original Nest Hello was rebranded as the Nest Doorbell (wired). [67] In October 2022, the 2nd generation Nest Doorbell (wired) was launched in the US, adding back a number of features that were missing from the Nest Doorbell (battery) even when wired, including 24/7 ...

6. Alarm.com's touchless video doorbell is built for the COVID era

   www.aol.com/news/alarm-com-touchless-video...

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7. Electric bell - Wikipedia

   en.wikipedia.org/wiki/Electric_bell

   Bells used in early telephone systems derived current by a magneto generator cranked by the subscriber. In residential applications, a small bell-ringing transformer is usually used to power the doorbell circuit. So that bell circuits can be made with low-cost wiring methods, bell signal circuits are limited in voltage and power rating. [3]