Viking Horns four trumpet train Air Horn kit. This Horn system produces a Loud Sound of 149 decibels. Trumpets are black powder coated metal. Will replace your original horn, or can be installed as an auxiliary horn. Comes with a 1.5 gallon air tank, and 12 volt 150 PSI heavy duty air compressor. Includes Mounting Hardware, Brass Fittings, Teflon Sealer Tape, 1/4" Air Hose, Electric Air Valve, 240 PSI Air gauge, 120/150 PSI Air Pressure Switch, Installation Instructions, and a FREE horn button. Ideal for vehicles such as Truck, RV, SUV, Boat, and many more applications.