Prepare your semi to be Ready for the Road Ahead , with the ECCO 500 Series 12/24V 107 dB Sound Level Surface Mount Back-Up Alarm that offers proper alarms to notify spectators of a reversing vehicle. To promote safety and prevent potential accidents, this replacement component makes an audible sound any time a vehicle is in reverse. Fashioned with a weather-resistant design to operate in all types of environments. FleetPride is your First Click in Heavy Duty .