Voice control music selection and playback with your compatible Echo device or the Alexa app, Casting to multi-room music from a line-in or Bluetooth input is not currently supported, Echo Link - Stream hi-fi music to your stereo system: Devices, Multiple digital and analog inputs and outputs ensure compatibility with your existing stereo equipment, Stream hi-fi music to your stereo system Echo Link Audio, Upgrade your stereo system with high-fidelity streaming music and Alexa, Connect Echo Link to your stereo and group with other supported Echo devices and speakers to play music throughout your home, Stream hi-fi music to your stereo system Audio Echo Link