I just thought I would post this. This unit was manufactured by American Imex, and it has been recalled due to possibility of electrucution (spelling), and burning. It was recalled by the FDA (Federal Drug Administation). They are replacing these units free to all users, your doctor will need to provide another script. My wasn't really into it, since my frequency has increased quite a bit..."I don't have to write you another script than". Might help someone.