Can any of you folks who have the day/night mirror installed explain the two buttons on the bottom of the mirror, one on each side? From the picture on the website it appears that they may turn on/off what appear to be two small lights to the inside of these two buttons? Hard to tell what they do from the picture and description online. My dealer says it will cost about $276 for the parts and installation. Is it worth it? The description online says it quickly installs using current mirror attachment but the mirror attachment that came standard with my Pilot doesn't look like the photo online. Any info would be appreciated.