Gentex Corporation designs, develops, manufactures, and markets electro-optical products for the automotive, commercial building, and aircraft industries primarily in the United States, Germany, and Japan. It offers automotive mirrors, including automatic-dimming rearview mirrors, such as interior auto-dimming mirrors and exterior auto-dimming mirror sub-assemblies; and non-automatic-dimming rearview mirrors with electronic features. The company also provides fire protection products, which include smoke alarms and smoke detectors combined with various models of signaling appliances for office buildings, hotels, motels, military bases, college dormitories, nursing homes, and other commercial establishments; and single-station alarms for commercial and residential applications. In addition, it offers variable dimmable aircraft windows for aircraft manufacturers. The company sells its automotive mirror products directly through a direct sales force; and fire protection products directly and through manufacturer representative organizations to fire protection and security product distributors, electrical wholesale houses, and original equipment manufacturers of fire protection systems. Gentex Corporation was founded in 1974 and is headquartered in Zeeland, Michigan.