Get your semi Ready for the Road Ahead™ with bright flashing lights for warning and emergency situations, with the Ecco 3.7" ED3700 Series 3-LED Rectangular Warning Light. This replacement light alerts other workers, drivers, or spectators of a delicate situation by providing improved visibility through an alternating pattern. Engineered with a rugged outdoor body to perform its best in all types of climates. FleetPride is your First Click in Heavy Duty®.