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2. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   There are many types of wireless intercom systems on the market. Most wireless intercom systems communicate by radio waves using one of the frequencies allotted by various government agencies. Some wireless intercom systems communicate using the 802.11 standard. [1] There are also systems that advertise themselves as wireless, but communicate ...

3. Clear-Com - Wikipedia

   en.wikipedia.org/wiki/Clear-Com

   The company's FreeSpeak wireless intercom was nominated in 2020 for a TEC Award. [7] Clear-Com was purchased in 2010 by Southern California electronics manufacturer HME, known for supplying wireless headsets for drive-through fast-food restaurant operations. [8] Company headquarters were moved from Poway to Carlsbad, California, in 2018.

4. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   1980s MirTone intercom system. 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]

5. 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.

6. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is ...

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