No sound

  • Depending on the smartphone app (which requires HFP (Hands-free Profile)/HSP (Headset Profile)), you may hear a voice from the left unit only, but not from the right unit.
  • Check that the connected device and both the right and left units of the headset are turned on.
  • Check that the headset and the transmitting Bluetooth device are connected via Bluetooth A2DP.
  • Turn up the volume if it is too low.
  • Check that the connected device is playing back.
  • Pair the headset and the Bluetooth device again.