"300DB Train Horn for Your TruckOur 300DB(2*150DB) Train Horn offers the loudest sound on the market, while also being the most compact Train Horn offered.^ Dual tone loudlyThe 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 12V snail horn can help you reduce unnecessary injuries.^ Innovative Design: Our Horn features an extremely powerful directly injected mini-compressor to really charge and amp up the sound All integrated into one small but powerful device ^ Broad Compatibility: Train Electric Snail 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.^ Corrosion-corrosion & WaterproofThis loud are made of ABS polymer material with strong Corrosion-resistance and Waterproof function. Will not rust and short-circuit when it rains. It will not be cracked due to long-term exposure on sunny days, will not be affected by rain and strong light. It's very durable ^"