Kleinn Air Horns 102-1 XCR 2.0 Copper Coated Dual Truck Horn - Black Dual Air Horns, 16-3/4-Inches and 14-1/2-Inches Long Trumpets For Deeper Truck Horn Sound All Metal Body And Trumpets With Black XCR2.0 Corrosion Resistant Coating Vortex 4  12-Volt Electronic Air Horn Solenoid Included Up to 153.6-Decibel Output