You can take the unit apart and run an external mic from the signal leads. The current mic is in the middle right edge of the screen. I just cut the leads on mine because I didn't want the unit to try and automatically use it at all, it's trash and use BT phone functionality from the OEM side.
The disassembly is much like a cell phone where you have to take screws holding both pieces together out then run a plastic tool between the two parts around the edge to separate the clips.
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