What do the switch and button do?

I have the shifter too. I have been very happy with it. Not too hard to install, hardest is to remove the center console. I ripped the glue(?) holding the leather around my e-brake handle.

I used two needle nose pliers to remove the somewhat fragile retaining clip.

98.5 SVT Black/Blue
As Thomas Jefferson was fond of saying, "The price of freedom is eternal vigilance."
If you're driving 60 in the left lane do us all a favor, GTFOOTW..