This study will investigate the performance of four non-surgical bone conduction devices.

Inclusion Criteria:

1. Signed Informed Consent Form
2. Adults (from 18 to 84 years)
3. Pure tone average (PTA) bone conduction (BC) threshold (measured at 0.5, 1, 2 and 3 kHz) less than 25 dB HL on both ears
4. Fluent in Swedish to be able to read and understand patient information and informed consent process

Exclusion Criteria:

1. Participation in another clinical investigation which might cause interference with study participation.
2. Participants who do not have the ability or are unwilling to follow investigational procedures/requirements, e.g. to complete questionnaires, according to investigator's discretion.