Gentex Corporation designs, develops, manufactures, markets, and supplies digital vision, connected car, dimmable glass, fire protection technologies, audio products, medical devices, and consumer electronics. It operates through the Automotive Products, Audio Products, and Other segments. The company offers automotive products such as interior and exterior electrochromic automatic-dimming rearview mirrors, automotive electronics, and non-automatic-dimming rearview mirrors for passenger cars, light trucks, pick-up trucks, sport utility vehicles, and vans, sold to original equipment manufacturers, automotive suppliers, and aftermarket and accessory customers, as well as HomeLink modules for the automotive industry. It also provides variable dimmable windows to aircraft manufacturers and airline operators, and offers photoelectric smoke detectors and alarms, visual signaling alarms, photoelectric smoke alarms, electrochemical carbon monoxide alarms and detectors, audible and visual signaling appliances, and bells and speakers used in fire detection systems in office buildings, hotels, and other commercial and residential buildings. Its fire protection products are sold directly and through sales managers and manufacturer representative organizations to fire protection and security product distributors, electrical wholesale houses, and original equipment manufacturers of fire protection systems. The company is also involved in the research and development of nanofiber chemical sensing products, and markets and sells eSight smart glasses to consumers with visual impairment or eye conditions, as well as identity authentication and access control products that use biometrics technology. It operates in the United States, China, Germany, Japan, Mexico, South Korea, and internationally. Gentex Corporation was incorporated in 1974 and is headquartered in Zeeland, Michigan.