Viking Horns V103C-6-12/307 Super Loud 170 Decibels Three Trumpet Train Air Horn Kit Sound output:Super loud 170 decibels Construction: Metal Trumpets - In black color 5 gallon air tank (18 liter) Compressor: 200 PSI max pressure, 100% duty cycle. With 1/2" electric air valve solenoid, for increased air flow, to sound louder