Fit for 20PSI �� 120PSI Brand New Truck Air Horn Dual Trumpet 135db Super Loud Material: All Metal Base/ Chrome Plated Zinc Trumpets(Non-Rusting)Voltage��12V Mounting Hardware: Included This Air Horn needs an air source which is NOT includedSize�� Trumpet Diameter: 3.5" Short Trumpet Length: 8.7" Long Trumpet Length: 11"Fitment: Suitable for Car Trucks Boats All Types AutombilesPackage includes: 1X Truck Air Horn