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 RVs, SUVs & Trucks. Will sound at a loud 115db. 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 wire connection (positive & negative) for quick installation. Comes complete with rubber Mounting gaskets, stainless steel hardware, and installation instructions. Horn dimensions: 18-1/4" long.Product Description *IMPORTANT* While horn is out of environment, MUST perform inside trumpet cleaning before storing away.