After receiving the dongle, keep the surrounding environment without devices in the pairing state, turn on the headset to be bound, so that it is in pairing mode, the red and blue lights are flashing (long press on the button to enter the pairing mode for 5s), and then insert the dongle into the PC, when the dongle and the headset are connected to the headset (the blue light is flashing once every 10s), the dongle will be bound to the headset.