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2. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   Wireless intercom privacy can be provided if the audio stream is encrypted. Telex, HME, Altair and other intercom manufacturers offer encrypted wireless intercom for corporate, military and sports team customers desiring instant voice communications with privacy. [2] [3] The first use of encrypted wireless intercom in American football was in ...

3. 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.

4. 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 ...

5. Ring's latest device makes voice intercom systems smarter - AOL

   www.aol.com/news/amazon-ring-intercom-080037640.html

   It offers remote door control for people in big apartment blocks.

6. 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 ...

7. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   A butler uses an intercom on behalf of a lady. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]