Wolo (140) Sea Alert Chrome Plated Trumpet Horn - 12 Volt, Low Tone 12 volt, low tone Solid brass with a bright chrome plated finish, which will look great on any boat The sound chamber has a Lexan non-corrosive diaphragm, making it ideal for boats in salt or fresh water environments To eliminate vibration a stainless steel adjustable front pedestal bracket is included Sea Alert easily mounts on the bow or cabin top with stainless steel mounting hardware provided