2008 CX-7 GT w/ Sunroof.... Ceiling microphone?

in Mazda
I just bought this car. I now know that the little blue light in the overhead ceiling is for ambient lighting. Mine may need replacing as it is very weak...need info about doing that. 
however, there is a small speaker or microphone or similar (about 1 1/2" by 2" rectangle) about 5 inches to the right of the blue light.
What is that? What's it for? How is it used?
Thanks in advance!

however, there is a small speaker or microphone or similar (about 1 1/2" by 2" rectangle) about 5 inches to the right of the blue light.
What is that? What's it for? How is it used?
Thanks in advance!
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