It is under the glove box, passenger can see it. I have seen some on Teskas forum relocate it into the glovebox. The sensor to the left of the rearview mirror lights up blue to let you know it is on, pretty distracting at night. I am not sure if you can disable that or not. I was able to turn off the stupid voice information, thing would never shut up.
It has no integration with the Tesla system, stand alone thing.