What is this knob used for?

I looked in the Owner's Manual but didn't see anything about it. If it is in there and I missed, please point me in the right direction.
Thanks guys!
Trending Topics
The Best of Mercedes & AMG




My BMW had the vent in the center console through the cup holder section. That would keep a drink cooler or warmer for a time.
I suppose it will prevent accidental cookoff of ammunition when I keep my .40 Sig in the glovebox. I always worried about that.




