Be heard on the water with stainless steel Marine Trumpet Horns! Available in single trumpet or double trumpet designs, the electric boat horns require 12 volts and blast out 106dB (single trumpet) or 109dB (double trumpet). Adjustable front mount slides for custom fitting and included mounting gaskets prevent vibration during use. Stainless steel construction resists corrosion and rust for durability and performance. The marine horns each feature a 10 1/2" wiring harness and 4" diameter horn. Perfect for marine boats, RVs and trucks, the Marine Trumpet Horns provide enough decibels to notify or caution other boats or vehicles nearby. The boat horns come with a one year warranty and do NOT include mounting hardware.