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2. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   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 ...

3. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   A wireless intercom is a telecommunications device that enables voice communication without the need to run copper wires between intercom stations. A wired intercom system may incorporate wireless elements. There are many types of wireless intercom systems on the market. Most wireless intercom systems communicate by radio waves using one of the ...

4. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   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] Intercoms are generally mounted permanently in ...

5. Speaking tube - Wikipedia

   en.wikipedia.org/wiki/Speaking_tube

   Speaking tube. A speaking tube or voicepipe is a device based on two cones connected by an air pipe through which speech can be transmitted over an extended distance. Use of pipes was suggested by Francis Bacon in the New Atlantis (1672). The usage for telecommunications was experimented and proposed for administrative communications in 1782 by ...

6. ButterflyMX - Wikipedia

   en.wikipedia.org/wiki/ButterflyMX

   Website. www.butterflymx.com. ButterflyMX is an American property technology company that specializes in smartphone-based access control. ButterflyMX’s hardware offerings include video intercom systems and keypads that users can manage through a mobile application.

7. Interruptible foldback - Wikipedia

   en.wikipedia.org/wiki/Interruptible_foldback

   Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the director or assistant director to on-air talent or a remote location. [1][2][3][4][5][6 ...