SUNDELY&reg; Black Zinc Alloy Solo Single Trumpet Air Horn 150db 12V for Boat Car Train Vehicle Black Zinc Alloy Solo Single Trumpet Air Horn 150db 12V for Boat Car Train Vehicle 12V, 150 db (+/-5db) Made of zinc alloy Overall Dimensions: 17.7"L x 3.9"W x 3.9"H (44.95cm x 9.9cm x 9.9cm)