Bluetooth 4.0 with A2DP:
For Bluetooth pairing, unplug the audio cable and hold down the power button (FROM AN 'OFF' STATE) for 4 seconds to make your SubPac® S2 visible to devices, the Bluetooth LED will turn solid blue. Search for ‘SubPac S2’ in your transmitting device’s Bluetooth settings and pair with it as per the manufacturer’s recommendations. When successfully paired the LED will flash until audio is played, where it will turn solid again. Note that plugging in the line-in cable will automatically turn off Bluetooth and will disrupt streaming.