Mystery socket on A/T console

[rockchops]

I was wondering if anybody knew what purpose the socket-like thing on the center console next to the shifter on the Automatic 4-spd Yaris. I circled it in the attached picture. My attention was brought to it in a test drive that I took in a Yaris that was fresh off of the truck. It was missing the filler piece for that socket-thing and there was a piece of white plastic inside, which kind of looked like a button. Is there an option or package that makes use of that thing?