Equip your vehicle with the Kleinn 220 direct bolt-on dual black ABS train horn system, featuring two separate, heavy-duty matte black ABS plastic trumpets equipped with extra-wide bells designed to produce a bone-rattling locomotive horn blast that can be felt as well as heard. Engineered for universal application and maximum durability in the harshest environments, this premium dual train horn configuration delivers a high-impact, authentic railcar sound that easily cuts through ambient noise. For maximum airflow, ultimate reliability, and independent performance, each individual trumpet comes equipped with its own dedicated Vortex 4 Series Model 307 12-volt electronic air horn solenoid valve with a 1/4-inch OD airline input to ensure instantaneous air delivery right out of the box. Designed for a clean, professional, and versatile installation on builds with unique spatial constraints, this complete package requires an onboard pressurized air system to unleash its maximum acoustic potential.