Hearing aids and replacement components thereof; medical hearing instruments; medical hearing device incorporating software featuring machine learning and AI; Research and development in the field of hearing aids, hearing devices, audiological software and technology, and aural enhancement software and technologies; Hearing aid services; hearing aid fitting services; providing medical and medical audiological information in the field of hearing aids and hearing aid services; medical services in connection with the adjusting and altering of hearing aid systems and hearing aids; medical audiology services; administering hearing tests for medical diagnostic purposes; providing information in the field of treatment and testing for hearing loss, hearing impairments and disorders; providing hearing tests for medical purposes, and services relating to apparatus for use in testing and treating hearing disorders, namely, hearing aid services; medical consultancy in the field of hearing aids and medical hearing instruments; providing information in the field of the diagnosis and treatment of hearing and speech disabilities via a website; Silicon for use in the manufacture of medical devices; Custom manufacturing of medical devices featuring silicon