Gentex Corporation is an American electronics and technology company that develops, designs and manufactures automatic-dimming rear-view mirrors, camera-based driver assistance systems, and other equipment for the global automotive industry. They produce dimmable aircraft windows for the commercial, business and general aviation markets. In addition, the company produces photoelectric smoke detectors, signaling devices, and the HomeLink Wireless Control System for the North American fire protection market. The company's customers are GM, Ford, BMW, Mercedes, Tesla, Airbus, Audi, Toyota, Mazda, Nissan, Honda, Porshe, Bentley and so on.