Quad 4 Trumpet 149DB Loud Train Air Horn Chrome with 1.5 Gallon Tank and 150 PSI Compressor Full Complete Onboard System Kit for Car Boat Truck 1.5 Gallon(6 liter) Air Tank with 150 PSI 12v Air Compressor, thermal overload protection Loud Quad Chrome Trumpets Train Air Horn Made of four metal black painted trumpets to withstand all weather conditions This air horn system will produce a loud train sound at 149db, and surely will get anybody's attention around you Suitable for Cars, Trucks, SUV, RV and Boats