On my rear view mirror theres some buttons, like number 1, 2, 3 and then I believe an auto switch. What's that stuff do? Sure I could look it up in the book but I dont have the book with me now and Im bored at work. Thnx

 

Homelink buttons. After programming the unit correctly, you can use these buttons instead of carrying around separate garage door openers.

 

and auto button turns rearview mirror dimming funciton on and off

 

and the side mirror dimming also.