NIGHTFX? Guide Lights are the latest innovation from Lund? featuring plug n? play functionality. Installation is simple: attach the lights anywhere on your truck and plug into the OBD port. The lights are powered from the OBD, requiring no additional wiring. Activate the lights using your factory key fob or when any door to the vehicle is opened. They remain on for 30 seconds then fade off. Lights are sold as a set of four, made in the USA and are backed by a 3-Year Limited Warranty.