SUNDELY&reg; 12 Volt Chrome Plated Zinc Alloy Dual Twin Trumpet Air Horn + Compressor for Boat Train Car Vehicle 12 Volt Chrome Plated Zinc Alloy Dual Twin Trumpet Air Horn + Compressor for Boat Train Car Vehicle Overall Dimensions: 7.9"L x 5.5"W x 2.7"H (20cm x 13.97cm x 6.86cm), Trumpet Lengths: appr. 7.9" (20cm), 6.3" (16cm), Trumpets Bell Width: appr. 3.15" (8cm) DB output: 150 db (+/-5db), Input Voltage: 12V Main material: Chrome plated zinc alloy, Colour: Silver (Chrome Plated) Suitable for Cars, Boats, all Types automobiles and motorcycle