Wolo (125 The Dominator Stainless Steel Dual Trumpet Marine Horns - 12 Volt, Low and High Tone Two trumpets that are 100% stainless steel 304 non-magnetic grade with a bright polished finish that will not rust Trumpets are mounted next to each other for easy installation Will provide years of dependable maintenance free service Engineered for exterior use in almost any weather condition including fresh or salt water Does not require a compressor or hoses, saving time and money