The purpose of this is to replace the ugly and useless blank buttons in front of the cup holder on the 370z. There is also a hole in the bottom so that you can run a USB cable through the bottom to charge your phone or connect to an aftermarket head unit.

To install simply pull up on the cup holder, remove the 4 screws holding the blank panel in. Finally you can use a few dabs of epoxy on the outside of the piece to hold it in place, however you don't have to use epoxy, on my 370z it holds itself in place.