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 automotive industry.

In addition, the company produces photoelectric smoke detectors, signaling devices, and the HomeLink Wireless Control System for the North American fire protection market.

[1][7] Gentex created the first dual-sensor photoelectric smoke detector,[4][8][1] considered to be less prone to false alarms, while still quickly detecting smoldering fires.

[9] In the early 1990s, Gentex introduced a smoke detector equipped with a strobe light which is designed to alert deaf and hard of hearing individuals.

[13] These mirrors have forward- and rearward-facing sensors to measure the ambient light level and glare of approaching vehicles, respectively.

[8] In 1997 the geometry of the mirror's surface was adapted to create spherically curved glass with the goals of eliminating blind spots and offering an expanded field of view.

[19] The aircraft windows are electronically controlled: an electrical signal affects the action of a conductive medium between layers of glass.