Inclusion Criteria:  hearing impaired adults, with & w/o hearing aids (experiences) good written and spoken (Swiss) German language skills ability to fill in a questionnaire conscientiously informed consent as documented by signature asymmetric hearing loss: one unaidable ear (min. N6 hearing loss) / the other ear with N3 or N4 hearing loss availability of Smartphone availability of TV or Tablet ability to operate and handle the investigational device ability to describe listening impressions/experiences and the use of the hearing aid Ability to produce a reliable hearing test result  Exclusion Criteria:  Contraindications to the medical device: aidable hearing loss on the intended CROS side acute tinnitus (in either one ear and occurrence less than three months) anatomical deformity of the CROS ear (e.g. absence of the auricle) Known hypersensitivity or allergy to materials of the investigational device any auricle deformities, that prevents secure placement of the (test) devices no willingness to test the investigational device system no willingness to test the investigational device system for at least 8h a day Hint for psychological problems from investigators point of view reported fluctuating hearing that could influence the test result reported symptoms of vertigo and dizziness by participants