Years ago we offered those old, traditional-style air horns. Problem was, you had to find a place for the compressor, then a place for the horns, then hook up the tubing... Work, work, work; not much fun at all. These modern versions are much easier to install and everything is built into these compact units! These are true Italian air horns, and, as you may know, only the Italians know how to make super-loud, ear-piercing horns! These horns are easy to mount and come with a relay and installation instructions. Let's see: Get taken out by a semi, or let them know you're there? You get to choose. Of course if you're going through town at midnight, blasting your horns, you deserve to get thrown in the pokey. Our Compact Big Truck Sound Air Horn is rated at 134 dB at 4 inches, 110 dB at 6 feet, and the Compact Italian Air Horns and Ultra Compact Air Horns are rated at 139 dB at 4 inches, 115 dB at 6 feet. That's loud! Choose from our three available styles. Mount on your car, truck, motorcycle, boat, or lawn mower! Made in Italy from high-impact plastic with a steel air pump. Audio samples, sound output, and sizes available in the Product Information tab below. 12 volt, 18 amps.