Viking Horns V101C-5/003A Four Trumpet Train Sound 149 Decibels Air Horn Kit, With 150 PSI Air Compressor, 3 Gallon Air Tank Sound Output:Loud 149 decibels trian sound Horn Construction: 4 metal chrome plated trumpets Air Compressor: Heavy duty 12 volt 150 PSI Air Tank: 3 gallon FREE horn button included