Denso Electric Trumpet Car Horns Dual Tone Snail Super Loud Waterproof 12 Volt, Universal Fit

Large trumpet-shaped opening for high volume By adopting a large trumpet shape for the opening, it achieves a loud volume of 114dB/1m despite its compact body.Electrical current flows through a copper coil in the horn, making a magnetic field. The field makes a flat, circular diaphragm inside the horn oscillate, and the oscillation makes the horn's sound.

• Horns are meant to give drivers a means of warning other motorists about a potential danger.
• The driver uses the horn to warn others of the vehicle's approach or presence, or to call attention to some hazard. Motor vehicles, ships and trains are required by law in some countries to have horns.