This app is for Sony self-fitting hearing aids, CRE-C10 and CRE-E10. Easy and quick initial setup and remote control with kind instructions. Main Features Personalized to your hearing: The hearing aid can easily be customized to your hearing through the self-fitting test on the Sony | Hearing control app, so you don’t miss out on a thing. Easily controlled with your smartphone: Easy to set up yourself, control volume, sound balance (tone), and directionality* with the app. The device communicates to your smartphone by acoustic link and Bluetooth*. *except for CRE-C10 Warning: Depending on your condition, this product/app may not be available. Please refer to the package or "Safety and maintenance information" for details.