K40

Founded in 1981, K40 is based in Elgin, Illinois. They make laser jammer/detectors, as well as installed and on-dash radar detectors. K40 is recognized as one of the premier radar detector brands in the world. They are noted for their 1983 “Speeding Ticket Guarantee” - claiming to pay for a ticket if you get it while using their radar detectors. In 1984, they became the first to offer a custom installed detector. Several high-end vehicles like BMW and Mercedes-Benz made this standard equipment in some models.