Audio streaming [A2DP] is an audio protocol of Bluetooth technology. This profile allows for audio to be streamed wirelessly from your compatible device, such as a Smartphone, to the source unit so you can enjoy your favorite music or streaming music service such as Pandora or Spotify, wirelessly.
The Aux Input allows you to connect to the audio output of an external device such as an MP3 Player or Smartphone so you can enjoy your music through your system.
This units Pre-Amp outputs let you expand your system by adding one amp or signal processor.
Built-in 1A charger allows you to charge your USB connected device thru this units USB port.