Wolo (115) The Persuader Stainless Steel Single Trumpet Horn - 12 Volt, High Tone High Tone 100 percent stainless steel 304 non-magnetic grade with a bright polished finish that will not rust Designed for exterior mounting on any 12-volt vehicle; trucks, SUVs, RVs, and boats in a fresh or salt water environment and ideal for almost any weather condition Maintenance free and does not require a compressor or hoses Includes a stainless steel adjustable trumpet support to prevent vibration and comes complete with rubber gaskets and stainless steel mounting hardware