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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. 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 ...

  4. 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 ...

  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. Smart doorbell - Wikipedia

    en.wikipedia.org/wiki/Smart_doorbell

    A smart doorbell is an internet-connected doorbell that notifies the home owner on his or her device (smartphone or any other gadget) when a visitor arrives at the door. It activates when the visitor presses the button of the doorbell, or alternatively, when the doorbell senses a visitor with its built-in motion sensors. The smart doorbell lets ...

  7. 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]

  8. Wireless security camera - Wikipedia

    en.wikipedia.org/wiki/Wireless_security_camera

    However, some wireless security cameras are battery-powered, making the cameras truly wireless from top to bottom. Wireless cameras are proving very popular among modern security consumers due to their low installation costs (there is no need to run expensive video extension cables) and flexible mounting options; wireless cameras can be mounted ...

  9. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Wireless cameras are also easy and inexpensive to install. [166] Previous generations of wireless security cameras relied on analogue technology; modern wireless cameras use digital technology with usually more secure and interference-free signals. [ 167 ]

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