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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. Hikvision - Wikipedia

    en.wikipedia.org/wiki/Hikvision

    In June 2021, 224 Hikvision products were banned for one year by South Korea's Ministry of Science and ICT over forged test reports. [38] In September 2021, the Indian Navy's headquarters "asked its all formations to 'discontinue' procurement of CCTV cameras and surveillance systems from Hikvision," according to The Week.

  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. List of most-viewed YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-viewed...

    Specifically, to count as a legitimate view, a user must intentionally initiate the playback of the video and play at least 30 seconds of the video (or the entire video for shorter videos). Additionally, while replays count as views, there is a limit of 4 or 5 views per IP address during a 24-hour period, after which point, no further views ...

  6. 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 ...

  7. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Closed-circuit television (CCTV), also known as video surveillance, [1][2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point, point-to-multipoint (P2MP), or ...

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