We can use dual TYPE C cable connecting to Macbook and Macbook Pro for charging as well as USB DAC output. Because the original wire material is too long which would slow the recognition down. When the cable is not recognized, you can unplug it and insert again. When connecting to the computer in USB DAC mode, you can find that the audio output device appears FiiO BTR3K. With the white light on, the sound can be output. It is recommended to use FiiO LT-TC1, a double-end TYPE-C cable, which can be perfectly matched with the charging box data function of your Macbook Pro. What's more, it can also be charged by connecting the PD charger.