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2. 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.

3. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   Intercom mounting systems can be attached to most motorcycle helmets. [2] Several different types of technologies can be used, including various types of citizens band radio like for example PMR446 , Bluetooth , or dynamic mesh communication (DMC) which is a mesh based intercom system developed for motorcycle communication.

4. Duplex (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Duplex_(telecommunications)

   Full-duplex audio systems like telephones can create echo, which is distracting to users and impedes the performance of modems. Echo occurs when the sound originating from the far end comes out of the speaker at the near end and re-enters the microphone [a] there and is then sent back to the far end. The sound then reappears at the original ...

5. Model 500 telephone - Wikipedia

   en.wikipedia.org/wiki/Model_500_telephone

   The Western Electric model 500 telephone series was the standard domestic desk telephone set issued by the Bell System in North America from 1950 through the 1984 Bell System divestiture. The successor to the model 302 telephone, the model 500's modular construction compared to previous types simplified manufacture and repair and facilitated a ...

6. Phone etiquette 101: When it’s rude to be on speaker — and ...

   www.aol.com/news/phone-etiquette-101-rude...

   Don’t use speakerphone. Do not use speakerphone for calls you make in public — use headphones. This is especially true for video calls or when watching to something on your device. This ...

7. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   Modern emergency telephone powered by sound alone. A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication ...