SUNDELY&reg; 12 Volt Black Zinc Alloy Quadruple Trumpet Air Horn for Boat Train Car Vehicle 12 Volt Black Zinc Alloy Quadruple Trumpet Air Horn for Boat Train Car Vehicle Overall Dimensions: 13.8"L x 6.2"W x 6.6"H (35cm x 15.7cm x 15.7cm), Trumpet Lengths: appr. 13.8" (35cm), 11.5"(29.2cm), 9"(22.8cm), 6.7"(17cm), Trumpets Bell Width: appr. 3.9" (9.9cm) Main material: zinc alloy DB output: 150 db (+/-5db), Input Voltage: 12V, Colour: Black Suitable for Cars, Boats, all Types automobiles and motorcycle