When the battery is completely empty (for example when using the device for the first time or if the device has not been used for a long time), the power button/charging LED on the right headphone will not turn on immediately after it is connected to your PC.
Please wait a few minutes for it to be recognised. After waiting a few minutes after connecting the device and PC, check if the device is recognised on the PC.
When the PC recognises the device, the battery of the device will begin to charge.
IMPORTANT: If there is moisture on the device, wait 2 or 3 hours.