GAMPRO 12v 135db Twin Tone Dual Trumpets Air Horn Kit Chrome Plated ZINC Trumpets with Compressor for Cars, Trucks, SUV, Vans, RV, Motorcycles, Buses, and Boats Material: High Quality Weather Resistant Chrome Plated ZINC Trumpets(Non-Rusting) Overall Works on any 12V Vehicles, including Cars, Trucks, Vans, RV, Motorcycles, Buses, and Boats. Easy to install. Dual trumpets with High and low two tones. When they are working together, they can make a huge sound. Want to be Different? 135db SUPER LOUD, You can never be ignored whereever you are. WARNING: This horn is really loud. Please do not use it in the city or near school or near train tracks.