I can't believe how great this is! I am a music teacher and was looking for something to amplify my voice when I took my students Christmas caroling outside. While this did not have the power to make me extremely loud, it gave me just enough boost that I did not have to push my voice. I have used it in my music classroom and in my chorus rehearsals held in our school's gym. It is small and light, s I take it with me on my "travel day." It works great. Many members of my faculty want them now. It is so inexpensive, that I am not concerned with how long it will last.