This powerful, maintenance free, dual trumpet electric horn is made of a 100% non-magnetic stainless steel material with a bright polished finish that will not rust. Specially designed for exterior use, it is ideal for marine applications in a salt water environment but can also be used on other vehicles with a 12V system. Connection is simple with only four wires, and does not require an on-board air system. This means that a compressor and air tank are not required to crash the seas.