How to use Far-field Voice capture? and Gain of mic?

Products & Technology ReSpeaker
#1

Hello
I want to know How to use Far-field Voice capture ?, How far this function can use ?, How to change gain of mic?, How relation about gain of mic and Direction of mic?
I use Respeaker core V2.
Thank you.

#2

Hello, this product has been EOL, we no longer provide software support for this product.