Product Details: Equip your semi to be Ready for the Road Ahead™, with the ECCO 500 Series 12/24V 102 dB Sound Level Surface Mount Back-Up Alarm, a crucial alarm that notifies spectators of a reversing vehicle. After a vehicle is shifted to reverse, this replacement component makes an audible sound to promote safety and prevent potential accidents. Built with a durable weather-resistant construction to operate in all types of environments. FleetPride is your First Click in Heavy Duty®.