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  2. Video door-phone - Wikipedia

    en.wikipedia.org/wiki/Video_door-phone

    Video door entry consists of both outside and indoor elements: an outdoor panel on the outside, an electronic lock release, and an indoor monitor. The outdoor panel or street panel is installed beside the entrance door or gateway and incorporates different elements ready for use in any climate conditions: one or several pushbuttons to make the call (usually one per home or apartment), a micro ...

  3. AVI-SPL - Wikipedia

    en.wikipedia.org/wiki/AVI-SPL

    4,300+ (2023) [1] AVI-SPL is a multi-office provider of collaboration and audio video technologies, and managed AV services to businesses and organizations. The company installs equipment related to video conferencing and telepresence, digital media systems, audio, security systems, control rooms, and provides onsite staffing.

  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. Door phone - Wikipedia

    en.wikipedia.org/wiki/Door_phone

    Door phone. A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside. The device can also lock or unlock the door it has been configured to work with. Door phones have been used across a variety of commercial and residential ...

  6. Clear-Com - Wikipedia

    en.wikipedia.org/wiki/Clear-Com

    Clear-Com. Clear-Com, also known as ClearCom, is a manufacturer of electronic intercom products, widely used to enable stage management and crew communications in theatre, filmmaking, video and television production, concerts, professional sports competitions, special events and audiovisual presentations. Providing the first portable party-line ...

  7. Riedel Communications - Wikipedia

    en.wikipedia.org/wiki/Riedel_Communications

    Riedel was founded in 1987 in Wuppertal, Germany by Thomas Riedel. [1] Riedel has three business segments: manufacture of communication equipment, rental services, and radio distribution. The company has over 700 employees [2] and is based in the RIEDEL Technologie Park (Uellendahler Str. 353 in 42109 Wuppertal, Germany).

  8. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Battery-powered systems can be used by guides who are speaking to clients on walking tours. Public address systems consist of input sources (microphones, sound playback devices, etc.), amplifiers, control and monitoring equipment (e.g., LED indicator lights, VU meters, headphones), and loudspeakers.

  9. 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 ...

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