Gentex Corporation is a supplier of automatic-dimming (auto-dimming) rear-view mirrors and camera-based lighting-assist features to the global automotive industry. The Company also provides commercial smoke alarms and signaling devices to the North American fire protection market, as well as dimmable aircraft windows for the commercial, business and general aviation markets. The Company is involved in designing, developing, manufacturing and marketing interior and exterior auto-dimming automotive rear-view mirrors that utilize electrochromic technology to dim in proportion to the amount of headlight glare from trailing vehicle headlamps. The Company also manufactures non-automatic-dimming rear-view automotive mirrors with electronic features. On September 27, 2013, the Company acquired Johnson Controls' HomeLink business.