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2. TV Ears - Wikipedia

   en.wikipedia.org/wiki/Tv_ears

   TV Ears Digital is the wireless voice clarifying TV listening device that offers digital connectivity and is compatible with Dolby Digital, SRS, and PCM products. The system is light, weighing in at only two ounces, comes with an adjustable tone control, and ergonomically angled foam ear tips.

3. Radio jamming - Wikipedia

   en.wikipedia.org/wiki/Radio_jamming

   Radio jamming is the deliberate blocking of or interference with wireless communications. [1] [2] In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio. [3] The concept can be used in wireless data networks to disrupt information flow. [4]

4. The 7 Best Wireless Surround Sound Systems for an ... - AOL

   www.aol.com/lifestyle/best-wireless-surround...

   Best for Audio Fanatics: Nakamichi Shockwafe Elite. Best Theater Sound: Sony HT-A7000. Best Value: VIZIO M-Series 5.1. Best Upgrade For A Wired System: Samsung GW-Q990C. Affordable Low-Cord ...

5. Microwave transmission - Wikipedia

   en.wikipedia.org/wiki/Microwave_transmission

   Microwave transmission is the transmission of information by electromagnetic waves with wavelengths in the microwave frequency range of 300 MHz to 300 GHz (1 m - 1 mm wavelength) of the electromagnetic spectrum. Microwave signals are normally limited to the line of sight, so long-distance transmission using these signals requires a series of ...

6. 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". Later radio history increasingly involves matters of ...

7. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...