You can listen to samples of them on the site. I would love to have one of these in my truck. 170db is loud. I think that I have a stepper motor going out in my instrument cluster and my CD player is now taking and ejecting discs s-l-o-w-l-y. So, I will address those issues first. Then I will try to find a way to talk my wife into it. A guy cut us off last night on the freeway and it helped my case. I think that a 170db train horn would make someone urinate themselves. The site says that it can be heard from up to 4 miles away.