I would give this (VXH211C) horn 5 stars but there were no instructions and 1 mounting bolt and nut in the box. This horn is as loud as I expected, it's pretty easy to install and works well. I added another relay so that both compressors are powered by their own relay instead of being powered together by the same relay. From personal experience, I've found that all of these compact electric compressor horns (regardless of brand) sound very similar. None of these supercharged horns should be labeled "Train Horns". If you are looking for "train horn" you will need to go for one of the more expensive units with a large air reservoir and a large separate air compressor. This horn works great and sounds as good as an "AIR HORN" of this caliber should be.
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