Wolo (170-24) Ocean Alert Chrome Plated Dual Trumpet Horns - 24 Volt, Low and High Tone 24 volt, low and high tone Constructed of solid brass with a bright chrome finish and that will look great on any boat big or small The horns base plate is made of polished stainless steel Designed with Lexan non-corrosive diaphragms to provide years of dependable service, and making Ocean Alert ideal for salt or fresh water environments To eliminate vibration, a stainless steel adjustable front pedestal bracket is included