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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 [1] although licences are no longer ...

4. List of microphone manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_microphone...

   The following is a list of defunct microphone manufacturers with articles. Aiwa; Altec Lansing; American Microphone; Ampex; Astatic; Brush Development Company; Dynaco ...

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. Short-range device - Wikipedia

   en.wikipedia.org/wiki/Short-range_device

   A short-range device ( SRD ), described by ECC Recommendation 70-03, is a radio-frequency transmitter device used in telecommunication that has little capability of causing harmful interference to other radio equipment. Short-range devices are low-power transmitters, typically limited to 25–100 mW effective radiated power (ERP) or less ...

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