At 18 I was diagnosed with Mitral Valve Prolapse. Last week, I went back to the cardiologist just for a check-up and he thinks I was misdiagnosed. But of course he doesn't know what I have. So for the next 30 days I get to wear this. It has two electrodes that attach to my torso. It's not horribly uncomfortable, but it's not great. I even have to wear it while I sleep.