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2. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Old door bell pull knobs in Edinburgh, United Kingdom.It is unclear whether bells were rung by wire and pulleys, or by electrical connection. In most wired systems, a button on the outside next to the door, located around the height of the doorknob, activates a signaling device (usually a chime, bell, or buzzer) inside the building.

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. 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.

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. Radio - Wikipedia

   en.wikipedia.org/wiki/Radio

   It consists of a doorbell button beside the door containing a small battery powered transmitter. When the doorbell is pressed it sends a signal to a receiver inside the house with a speaker that sounds chimes to indicate someone is at the door. They usually use the 2.4 GHz ISM band.

7. Chime (bell instrument) - Wikipedia

   en.wikipedia.org/wiki/Chime_(bell_instrument)

   Eight-bell chime in its frame (McShane Bell Foundry, Maryland).Note that the bottom bells are static-chimes, and the top bell is also hung for swing-chiming on its own. A chime (/ ˈ t ʃ aɪ m /) or set of chimes is a carillon-like instrument, i.e. a pitched percussion instrument consisting of 22 or fewer bells.

8. Fire alarm system - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_system

   Remote annunciator: a device that connects directly to the panel; the annunciator's main purpose is to allow emergency personnel to view the system status and take command from outside the electrical room the panel is located in. Usually, annunciators are installed by the front door, the door the fire department responds by, or in a fire ...

9. Wind chime - Wikipedia

   en.wikipedia.org/wiki/Wind_chime

   A metal wind chime. Wind chimes are a type of percussion instrument constructed from suspended tubes, rods, bells, or other objects that are often made of metal or wood.The tubes or rods are suspended along with some type of weight or surface which the tubes or rods can strike when they or another wind-catching surface are blown by the natural movement of air outside.