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  2. Wireless intercom - Wikipedia

    en.wikipedia.org/wiki/Wireless_intercom

    Station - A wireless intercom unit. Outdoor Intercom - This is an intercom that can be placed by a building's doors and it operates like a doorbell, but people inside can talk to the visitor. Channels - Some wireless intercom systems have more than one channel so private conversations can occur between groups of intercoms.

  3. Clear-Com - Wikipedia

    en.wikipedia.org/wiki/Clear-Com

    The product line of Clear-Com has expanded beyond party-line wired units to include multi-channel intercoms and wireless technology. Clear-Com patented a multi-channel wired digital intercom system in 2009, used in the HelixNet product line. The company's FreeSpeak wireless intercom was nominated in 2020 for a TEC Award. [7]

  4. ButterflyMX - Wikipedia

    en.wikipedia.org/wiki/ButterflyMX

    ButterflyMX was founded in 2014 in New York City by Cyrus Claffey, Matthew Knoff, Kunal Shah, and Ivan Mihalj to address difficulties in traditionally wired intercom usage, installation, and administration.

  5. 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 ...

  6. Walkie-talkie - Wikipedia

    en.wikipedia.org/wiki/Walkie-talkie

    Walkie-talkies are widely used in any setting where portable radio communications are necessary, including business, public safety, military, outdoor recreation, and the like, and devices are available at numerous price points from inexpensive analog units sold as toys up to ruggedized (i.e. waterproof or intrinsically safe) analog and digital ...

  7. Look inside the Breakers, a 70-room, 138,300-square-foot ...

    www.aol.com/look-inside-breakers-70-room...

    Out in the hallway, speaking tubes allowed servants to communicate with each other in an early intercom system. Speaking tubes at the Breakers. Talia Lakritz/Business Insider

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