SUNDELY 24 Volt Chrome Plated Zinc Alloy Triple Trumpet Air Horn for Truck Boat Train Vehicle 24 Volt Chrome Plated Zinc Alloy Triple Trumpet Air Horn for Car Boat Train Vehicle Overall Dimensions: 11.5"L x 6.0"W x 6.2"H (29.2cm x 15.2cm x 15.7cm), Trumpet Lengths: appr. 11.5" (29.2cm), 9" (22.9cm), 6" (15.2cm), Trumpets Bell Width: appr. 3.54" (9cm) DB output: 150 db (+/-5db), Input Voltage: 24V Colour: Silver (Chrome Plated) Main material: Chrome plated zinc alloy