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  2. Crystal earpiece - Wikipedia

    en.wikipedia.org/wiki/Crystal_earpiece

    A crystal earpiece typically consists of a piezoelectric crystal with metal electrodes attached to either side, glued to a conical plastic or metal foil diaphragm, enclosed in a plastic case. The piezoelectric material used in early crystal earphones was Rochelle salt , but modern earphones use barium titanate , or less often quartz .

  3. The best wireless headphones for seniors in 2025 - AOL

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

    Earbuds are easily lost, too, but just try misplacing a full-size headphone. Below I've rounded up the best headphones for different kinds of users: audiophiles, budget shoppers, TV watchers and ...

  4. Interruptible foldback - Wikipedia

    en.wikipedia.org/wiki/Interruptible_foldback

    Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the director or assistant director to on-air talent or a remote location.

  5. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    1600 ohm magnetic headset. The early earphones used with wireless-era crystal sets had moving iron drivers that worked in a way similar to the horn loudspeakers of the period. Each earpiece contained a permanent magnet about which was a coil of wire which formed a second electromagnet. Both magnetic poles were close to a steel diaphragm of the ...

  6. Bluetooth - Wikipedia

    en.wikipedia.org/wiki/Bluetooth

    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).

  7. 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 ...