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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. Sennheiser MD 441 - Wikipedia

   en.wikipedia.org/wiki/Sennheiser_MD_441

   Sennheiser MD 441 The Sennheiser MD 441 is a large-diaphragm dynamic microphone introduced by Sennheiser in 1971. [1] Following the introduction of the MD 21 in 1953 and the Sennheiser MD 421 in 1960, the MD 441 was widely-used for radio and television reporting and was often seen as part of political appearances around the world.

4. Sennheiser MD 421 - Wikipedia

   en.wikipedia.org/wiki/Sennheiser_MD_421

   The Sennheiser MD 421 is a German cardioid dynamic microphone, widely used for speech in broadcasting and for music in live concerts and the recording studio. Introduced in 1960, the internal large-diaphragm transducer element of the MD 421 is still produced unchanged by Sennheiser. The MD 421 is considered a classic, an industry standard.

5. Sennheiser - Wikipedia

   en.wikipedia.org/wiki/Sennheiser

   Sennheiser electronic GmbH & Co. KG ( / ˈzɛnhaɪzər /, German pronunciation: [zɛnˈhaɪ̯zɐ]) is a German audio equipment manufacturer headquartered in Wedemark. Sennheiser specializes in equipment for both the consumer and professional audio markets, including microphones, headphones, and loudspeakers . Founded in 1945 by Fritz Sennheiser ...

6. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

7. List of Bluetooth profiles - Wikipedia

   en.wikipedia.org/wiki/List_of_Bluetooth_profiles

   Bluetooth HID is a lightweight wrapper of the human interface device protocol defined for USB. The use of the HID protocol simplifies host implementation (when supported by host operating systems) by re-use of some of the existing support for USB HID in order to support also Bluetooth HID. Keyboard and keypads must be secure.