Eliminate dangerous glare from rear-approaching headlights with this sophisticated night driving safety accessory from Gentex Corporation. Special sensors and electronic circuitry detect glare and automatically dim the mirror accordingly. The GENK40A features Homelink capabilities. Gentex mirrors come with a "wedge" mount fitting. This wedge mount is standard on most all US made and some foreign make vehicles. This unit comes with the Mito aftermarket wiring harness that makes for an easier and quicker installation.