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2. In-ear monitor - Wikipedia

   en.wikipedia.org/wiki/In-ear_monitor

   A pair of universal IEM earpieces (Etymotic ER-4S)The in-ear monitors themselves are the last stage of the signal path in the system. They are placed in the external ear canal and seal against its sides; the effectiveness of this seal is a major part of the effectiveness of the IEM.

3. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Earlier crystal radios suffered from severely reduced Q, and resulting selectivity, from the electrical load of the earphone or earpiece. Furthermore, with its efficient earpiece, the "rocket radio" did not require a large antenna to gather enough signal.

4. Interruptible foldback - Wikipedia

   en.wikipedia.org/wiki/Interruptible_foldback

   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 ...

5. Crystal earpiece - Wikipedia

   en.wikipedia.org/wiki/Crystal_earpiece

   Crystal earpieces are usually monaural devices with very low sound fidelity, but high sensitivity and impedance. Their peak use was probably with 1960s era transistor radios and hearing aids. They are not used with modern portable media players due to unacceptable sound quality. The main causes of poor performance with these earpieces are low ...

6. Walkie-talkie - Wikipedia

   en.wikipedia.org/wiki/Walkie-talkie

   Walkie-talkie. Recreational, toy and amateur radio walkie-talkies. Assorted two-way FRS and GMRS walkie talkies with hand mic. A walkie-talkie, more formally known as a handheld transceiver ( HT ), is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio ...

7. Antique radio - Wikipedia

   en.wikipedia.org/wiki/Antique_radio

   Homemade two tube radio from 1958. 1930s style homemade one-tube regenerative radio. The idea of radio as entertainment took off in 1920, with the opening of the first stations established specifically for broadcast to the public such as KDKA in Pittsburgh and WWJ in Detroit. More stations opened in cities across North America in the following ...