Edward Gale – ( Traer, IA ) Reviewed on: April 2013 MSA30x is an amazing invention! It’s so cheap and it’s very useful too. I love how everything sounds so clear once you put on your own MSA30x. I even like that it helps you save up on those batteries. Now, even if it costs a little bit expensive it’s still a lifetime investment because you don’t have to spend money on batteries, you can just charge it. What’s even better is that this deal came with a spare one. So you won’t have to go deaf while charging you can use the other one too.