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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. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   Console radio - A self-contained radio with speaker designed to stand on the floor. Table radio also called a "Mantel radio" - A self-contained radio with speaker designed to sit on a table, cabinet, or fireplace mantel. [5] [6] Table radios typically plug into a wall outlet, although some "cordless" battery powered table radios exist.

4. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   Starting 2015, some wireless speakers integrate VOIP telephony functions. [5] Other models have an integrated FM radio. The higher end models add an LCD screen to make it easier to select and store radio stations. Most wireless speakers have a built-in microphone, which allows to receive and make calls using a mobile phone in hands

5. 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 ...

6. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   Since a conventional speaker is similar in construction to a dynamic microphone (with a diaphragm, coil and magnet), speakers can actually work "in reverse" as microphones. Reciprocity applies, so the resulting microphone has the same impairments as a single-driver loudspeaker: limited low- and high-end frequency response, poorly controlled ...

7. Wireless telegraphy - Wikipedia

   en.wikipedia.org/wiki/Wireless_telegraphy

   Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [ 1 ] [ 2 ] Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires.