Viking Horns V103C-5/310 Loud 162 Decibels 4 Trumpet Train Air Horn Lit Sound Output: 162 decibels at a loud low pitch sound Horn Construction: All metal Cchrome trumpets Ait Tank Capacity: 3 gallon,with 6 ports Air Compressor: Heavy duty 200 PSI max pressure, 100% duty cycle FREE horn button included