2013 Steering Wheel Question

What is the blank next to the voice control button for? I am in the mood to find out and possibly put whatever should be there, there.

 

I believe there are buttons there if you have the factory nav system.

 

I have the jbl with entune, nav, bluetooth...etc and I have a blank there.

 

I have a 2013 and I do not even have the push to talk. I know that in a 2012 camry theres arrow keys there to navigate through the radio functions.

 

The voice control button comes with the upgraded jbl radio which is what I have. I have the exact steering wheel in picture.

 

I have different buttons on my '13 non-entune. Just the talk and disconnect buttons for the phone, and a large black cover.

 

Probably space they use for the 4runner wheel. 5th gen 4runners have the same wheel.