Viking Horns V311-1B All Metal Black 3 Trumpet Loud 152 Decibels Train Horn With 12 Volt Electric Air Valve Solenoid and Air Hose Sound output: 152db - 150 Hz Construction: all metal trumpets in black color Horn Size: 16-1/4 inch long. x 15 inch wide. x 11 inch high Front Bell Diameter: 6-1/4" each bell Includes Electric Valve Solenoid & Air Hose