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  2. TV Ears - Wikipedia

    en.wikipedia.org/wiki/Tv_ears

    Unlike TV Ears, transmitters for wireless headphone systems are typically capable of projecting audio waves to several different headsets at one time. Wireless systems are good for up to 20 meters and for advanced music and in-home movie-watching experiences.

  3. The Thing (listening device) - Wikipedia

    en.wikipedia.org/wiki/The_Thing_(listening_device)

    The Thing (listening device) The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945.

  4. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    Wireless (WiFi) modem - an automated short range digital data transmitter and receiver on a portable wireless device that communicates by microwaves with a nearby access point, a router or gateway, connecting the portable device with a local computer network to exchange data with other devices.

  5. History of radio - Wikipedia

    en.wikipedia.org/wiki/History_of_radio

    History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy".

  6. Shortwave broadcasting in the United States - Wikipedia

    en.wikipedia.org/wiki/Shortwave_broadcasting_in...

    The new transmitter was spared from flood waters, but the antenna was severely damaged by high winds. WRNO finally returned to broadcasting in 2009, operating four hours per day. On March 13, 2010, WRNO began transmitting a weekly religious broadcast in Arabic for a portion of its broadcast schedule.

  7. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave ...