Use a USB-A to Type-C data cable to connect the beltpack to the USB port at the bottom of the hub; simultaneously press and hold the "Volume +" and "Volume -" buttons on the side of the beltpack to enter the menu -> pairing, select the corresponding number and click the beltpack "B" button to confirm pairing.

Note: The beltpack needs to be powered on before pairing. The connected number cannot be selected again.