The Roadmaster 24.5" Round Air Horn -215 Hertz is the perfect choice for those who need a loud and powerful sound. This air horn produces a loud and powerful sound up to 130 decibels, with a frequency of 215 hertz. It is designed for a perfect fit and easy installation and has an operating pressure range of 100 psi. The air horn is lightweight and features a 6" flare. This air horn is the perfect choice for those who are looking for powerful sound. FleetPride is your First Click in Heavy Duty®.