Equip your vehicle with the Kleinn 500 direct bolt-on Sentinel triple black ABS train horn system, featuring three tuned matte black ABS plastic trumpets measuring 13.5 inches, 11.75 inches, and 8.5 inches in length mounted to a heavy-duty triangular steel base. Engineered for universal application and maximum durability in the harshest environments, this premium triple horn configuration features reversible trumpets that can be inverted on the bracket to deliver a realistic, multi-directional sound effect just like a real locomotive. Designed for ultimate installation flexibility on custom builds, the rugged assembly allows for secure under-body or rooftop mounting and unleashes an earth-shaking locomotive blast that easily cuts through ambient noise. This comprehensive high-performance package comes equipped with a heavy-duty Vortex 4 Series Model 307 12-volt electronic air horn solenoid valve and 12 feet of 1/4-inch high-pressure airline to ensure instantaneous air delivery and an authentic railcar blast right out of the box.