1. Turn on the headset. Press and hold the button for about 2 seconds.
2. Display the devices paired with the smartphone. Select [Setting] - [Bluetooth] Touch [WI-C400]. You hear voice guidance “BLUETOOTH connected”.
Disconnect the micro-USB cable, turn off the headset, then press and hold the power button and play/pause button simultaneously for more than 7 seconds. The indicator (blue) flashes 4 times ( ), and the settings such as the volume adjustment are reset to the factory settings. All pairing information is deleted.