The Sonitus SoundBite Hearing System prosthetic device is a bone conduction device that has been FDA cleared for treatment of single-sided deafness (SSD) and conductive hearing loss (CHL). The Sonitus SoundBite Hearing System consists of an In the Mouth (ITM) component an external microphone component, worn behind the ear (BTE), a calibration interface cable and PC-controlled calibration software for subject calibration. A charger is also provided to charge the ITM and the BTE. The objective of this multi-sites observational study is to assess the long-term patient use of the Sonitus SoundBite Hearing System.