Review on 🚗 Enhance Your Vehicle's Sound: SoundOriginal 12Volt Loud Car Air Horn with 150db Power and Automotive Relay - Ideal for Trucks, Cars, and Motorcycles (Red) by John Stowers

I like the sound as loud as the triple horns I replaced. The horn's two frequencies are mid-range, not as high as some. There is no sound delay because the compressor is built in and the air from the tubes does not have time to get to the horns. I used a relay just in case it affects the strength of the tone. There is only one mounting screw. This is fine as long as you have a solid vertical surface for a large bolt and can actually rotate it. According to the installation instructions, the downward angle should not exceed 26 degrees. This keeps road debris away from horns, but modern cars have underbody panels that block the sound of the horn. Try setting the horns high to get noise through the grille. An electric car without a grille? You're on your own.