What shall I do if I can not get B03 Bluetooth Adapter to pair with my Bluetooth Headphones or Speakers?

1) Turn off the Bluetooth of all mobile phones or PCs in the house.

What should I do if there is no sound?

1) Make sure to set audio format to PCM or Stereo when connect a TV with Optical or Coaxial output. Dolby / DTS is not supported.

Why the voice lag still here when use B03 with my Bluetooth headphones?

To achieve low latency, your receiving device is better also support ONLY aptX Low Latency. Or, the receiving device might use another codec (e.g. SBC, aptX), resulting in a 70-200ms audio delay which may be noticeable by some users.

Why are the Volume + / - of my B03 not working in TX mode, only works in RX mode?

1) In TX mode, take optical cable as the connected audio cable, the Volume +/- on B03 may not work if your device does not support Audio/Video Remote Control Profile.

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