Brand New 4 Trumpet Air Horn And Compressor/Air Tank kit. Horn system produces a Loud Sound of 144 decibels. Trumpets are all metal in black color. Will replace your original horn, or can be installed as an auxiliary horn. Comes with a 0.5 (1/2) gallon air tank, 12 volt 150 PSI heavy duty maintenance free air compressor, Mounting Hardware, Brass Fittings, 1/4" Air Hose, Electric Air Valve solenoid, 0-to-240 PSI Air pressure gauge, 90/110 PSI Air Pressure Switch, Teflon tape sealer, installation instructions, and a FREE HORN BUTTON. Ideal for vehicles such as Truck, RV, SUV, Pick-Up, Boat, and many other applications.Trumpet sizes: 13-3/4", 11-1/2", 9-1/4", 7-3/4" with 3-3/4" front diameter each. Air compressor size: 7" L x 3-1/4" W x 5-3/4" H. Air Rank size: 1/2 Gallon, 6" L, 5-1/4" H.