This app* is for Sony's CRE-C10, CRE-E10, and CRE-C20 self-fitting hearing aids. 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, sharpness (tone), and directional focus** with the app. The device communicates to your smartphone by acoustic link and Bluetooth***. * Sony | Hearing control app – Use app on smartphone to personalize settings. Network services, content, and operating system and software subject to terms and conditions and may be changed, interrupted or discontinued at any time and may require registration. ** Directional focus is available on CRE-E10 *** Bluetooth is available on CRE-E10 Note: - Some features may not be supported by certain devices. - Please visit https://sony.co.jp/en/hearing-control-info for details.