The first I ordered was for my best hearing ear and it worked great so I ordered one for my right ear. I have found that setting the left one at the best hearing program (program 1) and the right one with the “closed” dome (for the most volume) works best for me. I have a tone hearing problem that requires very expensive hearing aids which I have had in the past. These come very close to correcting the hearing of some of those hard of hearing tones and was an unexpected benefit. To top the quality as advertised off, the company is very responsive and excellent to work with.