Boss Audio - Bolt Marine Bluetooth Portable Speaker System with Flashlight - Pair - Black - BOLTBLK. Audio Streaming. 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.. Aux Input. The Aux Input allows you to connect to the audio output of an external