Vixen Horns Loud 125dB Powerful Dual Stainless Steel Trumpets Marine Electric Train Air Horn for Boats/RV/Trucks Chrome 12V VXH2112Mar Does not require a compressor simple two wires connection (positive and negative) Electric 12v / sound output: 125db, easy installation with provided bracket Specially designed for marine applications, ideal for boats, yacht, RV and trucks Engineered for exterior use in almost any weather condition including rain or salt water