Subject´s Preference Regarding Hearing Performance and Functionality Using a New Sound Processor

Inclusion Criteria: * Completed clinical investigation CBAS5539, and an active user of the Osia System. * Signed Informed consent. * Subject with conductive or mixed hearing loss in the implanted ear. Bone conduction thresholds with pure tone average (PTA4; mean of 0.5, 1, 2 and 4 kHz) of ≤ 55 dB HL. OR subject with single-sided sensorineural deafness. Air conduction thresholds with a pure tone average PTA4 of ≤ 20 dB (decibel) HL (Hearing Level) (mean of 0.5, 1, 2 and 3 kHz) in the good ear. \- Optimally fitted with Osia Sound processor, according to subject's experience prior to inclusion. Exclusion Criteria: * Any ongoing soft tissue complication that could significantly affect the use of the Osia 2 Sound Processor during the 6 weeks period * Use of ototoxic drugs that could be harmful to the hearing, as judged by the investigator * Unable to follow investigational procedures and instructions, e.g. inability to complete quality of life scales or audiological testing as described in the Clinical Investigation Plan (CIP). * Participation in another clinical investigation with pharmaceutical and/or device.