DENSO+s First Time Fit relays are no different from the OE relays DENSO has manufactured for over 60 years + built to be quiet, efficient, and reliable. Designed and manufactured to outlast the closest competitor by a minimum of ten times more life cycles, DENSO+s First Time Fit Relays will most likely out last your car. Holding approximately 30,000 active patents worldwide - approximately 7,300 in the United States - DENSO is going all out to design groundbreaking systems and components tuned especially to consumers' specifications - whether they are drivers, passengers, pedestrians or society as a whole.