Extreme Duty Dual Trumpet Horn Air Length 14 1/2 in Width 7 3/4 in Height 5 in Material Steel Finish Chrome Plated Trumpets and Black Base Roof Mounting Decibels 125 dB Pressure 80 to 110 PSI For Use On Trucks With Existing Onboard Air System Includes Inlet Hose with Brass Fittings Gasket and Stainless Steel Mounting Hardware