I had the (dis)pleasure of being in the same room as a mosquito while it was being tested. It was so painful to my hearing I had to cover my ears, which actually didn't help.<br>Thankfully they shut it off once they noticed my (genuine) discomfort.<br><br>I was 34 at the time and it was loud and clear. I can't imagine how bad that would be to a teenager.<br>Now granted, you're not supposed to be within 5 feet of the unit while it's operating, as it's supposed to be mounted on a telephone pole 30-40 feet up, and dispersed over a wide area. But I could hear it without issue.