Viking Horns V103C-6/307B Loud 152 Decibels Three Trumpet Black Train Air Horn Kit With 5 Gallon Air Tank and 200 PSI air Compressor Sound output: 152 decibels Construction: all metal trumpets in black color 5 gallon air tank (18 liter) Air Compressor: 200 PSI max pressure, 100% duty cycle. FREE horn button included