Product Details: Equip your semi truck to be Ready for the Road Ahead™, with the Grote 2 / 45A Square 2-Pin 20-Light Heavy Duty Electronic Flasher, a key component that provides steady flash rates for lights. By utilizing a 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. Built with a versatile design to be suitable for everyday driving, alarms, or hazardous situations. FleetPride is your First Click in Heavy Duty®.