The Yamaha Headphone Control app allows custom feature adjustment and personalization for select Yamaha headphones and earbuds. SUPPORTED MODEL - Yamaha TW-E5B, TW-ES5A, TW-E7B, TW-E3C, YH-E700B, YH-L700A, YH-L500A APP FEATURES - CONTROL: Easily navigate and adjust settings such as Ambient Sound and Listening Care. - PERSONALIZE: Customize Equalizer (EQ) settings to suit your preferences. - SUPPORT: Quick access to User Guide and instructional videos. - UPDATE: Keep your earbuds up-to-date with latest firmware. NOTE: - Some features may not be available for all models. - Some models may not be available in all countries or regions. - This App does NOT work with the following models: YH-E700A, YH-E500A, TW-E3B, TW-E3A, EP-E70A, EP-E50A, EP-E30A *You will need to download and use the Yamaha HEADPHONES CONTROLLER App for these specific models.