PAIR of Single Rectangle 152db Trumpet Truck Style Air Horn & VIAIR 280c 150psi 2gal. Complete Kit- Sound Like a MACK Truck PAIR of "Big Rig" 152db Earth Shaking Rectangle Outlet Trumpet Air Horn VIAIR 280c Compressor(150psi) w/2 Gallon tank Kit(PN:20005) VIAIR 150psi Air Syetem Kit -The BEST Horn on the Market GREAT for Trucks, RV's, Boats...ANYTHING!! Complete with Install Instructions & 1 Year VIAIR Warranty