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[Riky1]

The microphone arm of headsets comes in external microphone type and
voicetube type. External microphone designs have the microphone housed
in the front end of the microphone arm, inside a microphone capsule.
Voicetube designs are also called internal microphone design, and have
the microphone housed near ear-piece. The sound travels through the
tube to the hidden microphone.
http://www.ultimateheadsets.com/

[master9147]

Spammer...