Anything you physically put in your ear is capable of changing how you hear something. It looks like it's made of some sort of rubber. I don't how that compares to ones skin wrt acoustic properties. Although it will shrink the size of your ear canal where it's placed. Also, they claim "Calmer sits barely visible in the ear and uses revolutionary, non-electric technology to reduce mid and high frequency distortion without having a detrimental effect on our hearing" How does a passive piece of something discriminate between mid and high frequency distortion and mid and high frequencies? Also, hearing something and detecting what it is, or what's being said, is different than listening to music.Yeah, I was much more interested in their "claims" of improved sound quality.