Viking Horns V623K-2C Loud 139 Decibels Dual Chrome Trumpets With Dual Compressors Air Horn Sound output: 139 decibles Construction: Metal base with Dual Chrome plated trumpets 2 Heavy duty 12 volt air compressors Trumpets dimensions: 11-1/2", 9", with 3-1/2" dia. each Includes hardware and installation instructions