SUNDELY&reg; 12 Volt Black Zinc Alloy Triple Trumpet Air Horn + Compressor for Boat Train Car Vehicle 12 Volt Black Zinc Alloy Triple Trumpet Air Horn + Compressor for Boat Train Car 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: 12V Main material: zinc alloy, Colour: Black Suitable for Cars, Boats, all Types automobiles and motorcycle