The Genuine Mazda Accessory Auto Dimming Rearview Mirror comes equipped with a bright LCD Compass to keep you on the right road and HomeLink® to make your life more convenient and safe. It has backlit buttons to make opening your garage or gate even easier. And it allows you to replace up to three of your transmitters with dedicated buttons on the mirror. The Auto Dimming feature uses high-tech sensors to detect headlight glare and automatically dims to eliminate it, leaving your view of the road intact.