1Wide Application: Our air horn is designed for external use and is available for 12?24V power systems, which is very suitable for cars, trucks, boats, trains and etc. 2Stable Performance: Our 4 trumpets horn is made from stable and tough zinc alloy, and the surface is brightly polished and will not rust, suitable for all weather. 3Super Loud: This air horn has 4 trumpets and can produce the sound as loud as 150DB. The great sound effect can blare out powerful warning and catch everyone's attention, which is very practical. 4Durable Serving: This air horn is made to ensure maximum strength and sturdy performance, which is durable and portable. 5Convenient to Use: The installation process is easy and quick, and the kit includes basic mounting hardwares, no complicated drilling or tools is required, which is both time saving and effortless.