This single trumpet electric horn is 100% stainless steel housing, 304 non-magnetic grade with a bright polished finish that will not rust. Designed for exterior use and ideal for boats in a salt water environment and also RV's, SUV's & Trucks. Will sound at a loud 115 decibels. Ideal for any 12-volt system vehicle in almost any weather condition. This horn is maintenance free and does not require a compressor or hoses. Simple 2 positive & negative wire connection for quick installation. Comes complete with rubber Mounting gaskets, stainless steel hardware, and installation instructions.