1Wide Application: Air horn is designed for external use and is very suitable for marine applications, but it can also be used in other vehicles with 12V systems, such as RVs, SUVs and trucks. 2328DB Super Loud: Single trumpet can produce sound as loud as 328DB. The great powerful sound catches everyone's attention, dependable and practical. 3Premium Material: Single trumpet is made of nonmagnetic stainless steel, the surface is brightly polished and will not rust, suitable for all weather. 4Portable: Air horn is flexible and portable so it has the reflexes to take from one car to another easily. 5Easy Installation: The installation is simple with provided bracket, the two wires can be easily connected, quick to install.