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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...

3. 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 ...

4. 2.4 GHz radio use - Wikipedia

   en.wikipedia.org/wiki/2.4_GHz_radio_use

   Many of the cordless telephones and baby monitors in the United States and Canada use the 2.4 GHz frequency, [ 1] the same frequency at which Wi-Fi standards 802.11b, 802.11g, 802.11n and 802.11ax operate. This can cause a significant decrease in speed, or sometimes the total blocking of the Wi-Fi signal when a conversation on the phone takes ...

5. Citizens band radio - Wikipedia

   en.wikipedia.org/wiki/Citizens_band_radio

   Shown with Astatic brand D-104 desk mic. Citizens band radio ( CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.

6. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   A wireless microphone transmits the audio as a radio or optical signal rather than via a cable. It usually sends its signal using a small radio transmitter to a nearby receiver connected to the sound system, but it can also use infrared waves if the transmitter and receiver are within sight of each other.

7. Radio - Wikipedia

   en.wikipedia.org/wiki/Radio

   Wireless microphone – a battery-powered microphone with a short-range transmitter that is handheld or worn on a person's body which transmits its sound by radio to a nearby receiver unit connected to a sound system. Wireless microphones are used by public speakers, performers, and television personalities so they can move freely without ...