Loud 149 Decibels Train Sound Air Horn. Entirely made of metal, in black color. Comes with a 1.5 (6 liter) air tank, 150 PSI 12 volt Heavy Duty Air compressor, 240 PSI air pressure gauge, 120/150 PSI air pressure switch, mounting hardware, hose, fittings, instructions, and a FREE horn button. This horn will produce a loud sound that will surely get anybody's attention around you. Great for SUV's, trucks, RV's, pick-ups, boats, and more applications. Horn trumpets dimensions: 15-1/4", 13-1/4", 12". Air compressor size: 9-1/2" L x 4" W x 6-3/4" H. Air tank size: 17" L, 7-1/2" H.