Gentex Corp. is a technology company, which engages in the design, development, and manufacture and supply of digital vision, connected car, dimmable glass, and fire protection products. The company is headquartered in Zeeland, Michigan and currently employs 5,466 full-time employees. The firm provides automatic-dimming and non-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 firm's business segment involves designing, developing, manufacturing, and marketing interior and exterior automatic-dimming automotive rearview mirrors that utilizes 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 value added features to the interior and exterior automotive rearview mirrors as well as electronics for interior visors, overhead consoles, and other locations in the vehicle.