Equip your semi to be Ready for the Road Ahead , with the ECCO 12/24V 97 dB Sound Level Multi-Frequency Back-Up Alarm, a crucial alarm that notifies spectators of a reversing vehicle. Once a vehicle is in reverse, this replacement component creates an audible sound to promote safety and prevent potential accidents. Manufactured with a weather-resistant design to operate in all types of environments. FleetPride is your First Click in Heavy Duty .