ABS polymer material, strong corrosion resistance, waterproof product, no rust in rain, no short circuit, prolong service life, and use more worry-free. (60B on the product refers to the model/product number, not the speaker decibel) | The internal reflux design, up to 300DB loudness, gives you a loud voice to warn others, and provides a certain degree of safety for driving. Our snail horn can help you reduce unnecessary injuries | There is no bulky air compressor, only a small device that produces incredible sound! Its so compact, almost HALF of our customers buy and install 4 horns for double the loudness! | The unique mounting bracket design makes the installation firmer, and the bracket is universal, allowing you to install it in any position, it only requires 12V power supply and lower power consumption. | Train Horn is Suitable For Almost Any Vehicle! While It's the perfect upgrade for trucks, our horn is also compatible with SUVs, passenger cars, boats and motorcycles.