Viking Horns V101C-5/4008 Loud 149 Decibles Chrome 4 Trumpet Train Air Horn Kit With 3 Gallon Air Tank/Compressor Sound Output:149 decibels Horn Construction: 4 trumpet metal chrome plated Air Compressor: Heavy duty 12 volt 16 amps, 150 psi Tank Capacity: 3 Gallons (12 Liters) Supplied With a FREE horn button