If you speak too softly/ mumble this is the product for you!
I have not used these in a concert setting. I blew out my eardrum in 2007 so whenever I speak out loud to me it sounds like I'm yelling but In reality I'm mumbling. I discovered after an ear infection that plugging one of my ear actually muted my voice so I didn't sound like I was yelling since I couldn't hear myself speak but would actually project my voice louder so people can hear me speak at a normal volume. I use this every day! I literally can't hear myself talk out loud so it's great because I now annunciate and project my voice and thats important in my job working in customer service.  Highly recommend for people who have issues with speaking too softly.
Rating: 4 stars