Kleinn Air Horns 220 Dual Train Horn - Black Two Separate Mounting Air Horns - 10.5-Inches and 15.5-Inches Requires 150-PSI Onboard Air System (Not Included) Black High Impact ABS Train Horn Trumpets (2) 'Vortex 4' 12-Volt Electronic Air Horn Solenoids Included Up To 154.2 Decibel Output