[Materials of Air Horn]: Our air horn is made of excellent chrome-plated zinc and high-quality ABS plastic, which is waterproof, wear-resistant and corrosion-resistant, so you can still use the air horn without worry even on rainy days. The purpose of our products is to let you use them for a long time, so you dont need to worry about its quality. [Easy to Install]: Our train horn kit is very easy to install. You just need to connect the horn wire on the car and the two wires from the air horn, and it will work normally Positive to positive, negative to negative(The installation instructions for the product are attached to our products, and you can install them by checking the instructions). [600DB Super loud]: The upgraded air compressor and larger coil can be made into stronger air pressure, which promotes louder and clearer sound from the horn [Widely used]: The air horn is suitable for all 12V vehicles, Can be used for SUV, motorcycle, yacht, boat, off-road vehicle, bus, train, etc.