Ensure your semi truck is Ready for the Road Ahead with steady flash rates for lights, with the Grote 1 / 20A Square 3-Pin Variable-Load Electronic LED Flasher. Thanks to its straightforward design, this replacement device is able to set a consistent flash rate for lights, creating a controlled pattern that can be seen by other vehicles or pedestrians. Crafted with a versatile design to be suitable for everyday driving, alarms, or hazardous situations. FleetPride is your First Click in Heavy Duty .