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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   Singer Cody Simpson using a wireless microphone headset in a 2013 concert in Montreal. 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 ...

3. Wireless microphone licensing - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone_licensing

   In the UK, use of wireless microphone systems requires a Wireless Telegraphy Act license, except for the license free bands of 173.8–175.0 MHz and 863–865 MHz, sometimes referred to as "Channel 70" (not to be confused with TV Channel 69, which was 854–862 MHz and always required a license from JFMG Ltd although licences are no longer available for that band).

4. Shure - Wikipedia

   en.wikipedia.org/wiki/Shure

   Shure manufactures several lines of wireless microphone systems, many of them utilizing microphone capsules from their wired microphones models such as the SM58, SM87, Beta 58, and Beta87A. The systems range in scope from entry-level to high-end systems used for touring and large-scale event applications.

5. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...

6. 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 ...

7. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Battery-powered systems can be used by guides who are speaking to clients on walking tours. Public address systems consist of input sources (microphones, sound playback devices, etc.), amplifiers, control and monitoring equipment (e.g., LED indicator lights, VU meters, headphones), and loudspeakers.