Gentex Corporation designs and manufactures automatic-dimming rearview mirrors and electronics for the automotive industry, dimmable aircraft windows for the aviation industry, and commercial smoke alarms and signaling devices for the fire protection industry. The Company's business segment involves designing, developing, manufacturing and marketing interior and exterior automatic-dimming automotive rearview mirrors that utilize electrochromic technology to dim in proportion to the amount of headlight glare from trailing vehicle headlamps. Within this business segment, the Company also designs, develops and manufactures various electronics that are features to the interior and exterior automotive rearview mirrors, as well as interior visors, overhead consoles, and other locations in the vehicle. The Company ships its products to all of the automotive producing regions across the world, which it supports with various sales, engineering and distribution locations across the world.