Multi-center Study to Examine Changes to the Environment Surrounding the Electrodes in the Cochlea and to Capture the Most Challenging Listening Environments Experienced by Persons with a Cochlear Implant

Inclusion Criteria:

• Aged 18 years or older (no upper age limit).

• Implanted with CIC4-based implant with a Contour Advance, Slim Straight or SlimModiolar electrode array with at least 6 months experience.

• Candidate is a fluent speaker in the language used to assess speech perceptionperformance, as determined by the investigator.

• Willing and able to provide written informed consent.

Exclusion Criteria:

• Score below 3 on the screening subset of questions from the Mobile DeviceProficiency Questionnaire (digital literacy check).

• A failed ECE1 or ECE2 (i.e. flagged, open circuit or short circuit)

• Additional health factors, known to the investigator, that would prevent or restrictparticipation in the evaluations, including significant visual impairment and/ordexterity issues.

• Unable or unwilling to comply with the requirements of the clinical investigation asdetermined by the Investigator.

• Investigator site personnel directly affiliated with this study and/or theirimmediate families; immediate family is defined as a spouse, parent, child, orsibling.

• Cochlear employees or employees of Contract Research Organisations or contractorsengaged by Cochlear for the purposes of this investigation.

• Current participation, or participation in another interventional clinicalstudy/trial in the past 30 days, involving an investigational drug or device (unlessthe other investigation was/is a Cochlear sponsored investigation and determined bythe investigator or Sponsor to not impact this investigation)