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2. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

3. TV Ears - Wikipedia

   en.wikipedia.org/wiki/Tv_ears

   The 5.0 Dual Digital wireless TV listening system, is the most powerful of the TV Ears’ headsets, containing twice the number of light emitting diodes. The system operates off of a digital connectivity via an optical digital audio cord and is compatible with Dolby Digital, SRS, and PCM ensuring that it works successfully with any television ...

4. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...

5. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Website. www .bluetooth .com. A Bluetooth earbud, an earphone and microphone that communicates with a cellphone using the Bluetooth protocol. Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs).

6. Wireless telegraphy - Wikipedia

   en.wikipedia.org/wiki/Wireless_telegraphy

   Wireless telegraphy or radiotelegraphy, commonly called CW ( continuous wave ), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method. It was transmitted by several different modulation methods during its history.

7. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Standard headphones used in telephone work had a low impedance, often 75 Ω, and required more current than a crystal radio could supply. Therefore, the type used with crystal set radios (and other sensitive equipment) was wound with more turns of finer wire giving it a high impedance of 2000–8000 Ω.