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Mike/Mic Gain (or "DynaMike" on Cobra CB's), is your microphone's transmit "volume control", & can be lowered to reduce backround noise, or if your voice is really loud. Normally, this is turned up full however, if you are close to another radio user, you might sound distorted to them as you would be "over driving" your voice, so you would need to turn this down when speaking to close stations. Mic Gain

Mic gain control is found on more expensive models.

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