"The Headphones Controller App provides easy operation for Yamaha earphones and headphones connection to your devices. Supported Models : TW-E3A, TW-E3B, EP-E30A, EP-E50A, EP-E70A, YH-E500A, YH-E700A, YH-L700A ++++++++++++++++ Compatibility -Requires Android 7 or later -Bluetooth connection is required from your smart device with the app installed and the compatible Yamaha headphones/earphones. ++++++++++++++++ Key Features: -ON/OFF LISTENING CARE -ON/OFF NOISE CANCELLING / AMBIENT SOUND / LIS