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2. 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]

3. 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. The smart doorbell lets ...

4. Shop the best QVC Black Friday sales — including Oprah's ...

   www.aol.com/lifestyle/shop-the-best-qvc-black...

   Right now, its soundbar — a small but powerful wireless model — is on sale for $199. ... Eufy 1080p Video Doorbell with Chime. ... Capture crisp 1080p HD video along with a chime you can put ...

5. Ring (company) - Wikipedia

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

   The "Ring Chime" accessory is a unit plugged into a power outlet to play the doorbell's chime. The "Chime Pro" is an extended version that also doubles as a wireless repeater for Wi-Fi networks. [46] In November 2020, Amazon announced the recall of 350,000 Ring doorbells in the United States and 8,700 in Canada due to a potential fire risk. [47]

6. The 7 Best Home Security Systems for the Money - AOL

   www.aol.com/7-best-home-security-systems...

   You will need to use Ring video doorbells and cameras. Ring is “no-frills home security,” according to Safewise.com, but it will serve the basic function of intrusion detection if a door or ...

7. Door phone - Wikipedia

   en.wikipedia.org/wiki/Door_phone

   Video door phone indoor terminal.. Going a little further in time, we find video door phones featuring a video installation apart from the classical audio. In these cases, the intercom plate has the same structure as the previous version but features a video monitor connected to a surveillance camera that allows inspecting the person who pressed the button and part of the surrounding area.