Product Details: Equip your semi to be Ready for the Road Ahead™, with the ECCO 800 Series 12 / 36 Volt 112 dB Sound Level Surface Mount Back-Up Alarm, a crucial alarm that notifies spectators of a reversing vehicle. Due to its direct connection with the reverse mechanism, this replacement component is able to create an audible sound any time a vehicle is in reverse. Constructed with a weather-resistant design to operate in all types of environments. FleetPride is your First Click in Heavy Duty®.