Inclusion Criteria:  Children and adolescents between the ages of 7 and 17 years old. With normal middle ear characteristics With a hearing impairment in the mild to severe range With adequate speech development  Exclusion Criteria:  Unreliability and lack of cooperation exists, An effusion in the middle ear or local inflammation in the ear canal or middle ear with/without a running ear, Mental limitations, If the patient is unable to operate a smartphone, Other objections to study participation in the opinion of the study director exist.