Equip your semi to be Ready for the Road Ahead , with the OTR 12/24V 107 dB Back-Up Alarm, a crucial alarm that notifies spectators of a reversing vehicle. This replacement component creates an audible sound any time a vehicle is in reverse, to promote safety and prevent potential accidents. Engineered with a durable weather-resistant construction to operate in all types of environments. FleetPride is your First Click in Heavy Duty .