So, I wanted to get one for the car and one for the bike. Ordered one, and finaly got it, and decided to test it. Started the car, took two wires with clips, one end of both wires clipped to the connectors on the horn, another pair holding in my hands, and touched the battery. So, I was like 2 ft away from the horn. I did place the horn so that the sound goes away from me. But you know with sound it doesn't matter much. I did blow the horn a few times, interchanging with blowing the horn of the car a few times. Ear Cannon was noticeably louder than my regular car horn ('02 Dodge Intrepid), but sounded like your typical dual frequency air horn. I did hold it for a longer duration - like 1 - 2 sec continuously while standing next to it since I had to touch the battery. It was loud, but I didn't hear any ringing in my ears, and it was pretty sustainable. Frequency wise, this is nothing like a locomotive horn - a bunch of BS. Compactness of the design is a big plus, especially if mounting on a bike. Another side effect of compactness is a quick reaction time - the LESS air to move from the compressor to the horn, the quicker the sound comes ON when you press the button. I am curious to get a DB meter from ebay and see how loud it is compared to my car horn.