Four trumpet train Air Horn and compressor/tank 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 maintenance free 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. Trumpets length: 13-3/4", 11-1/2", 9", 71/2", 3-3/4" diameter each. Air compressor dimensions: 9-1/2" L x 4" W x 6-3/4" H. Air tank dimensions: 15" L, 7-1/2" H.