If the earbuds do not charge when placed in the charging case, please try the following troubleshooting steps:

1. Check placement and cleanliness: make sure the earbuds are placed correctly in the charging case and that the ear wings are installed properly. Check whether the charging contacts on the earbuds or the charging pins in the case are blocked by dirt or debris, which can prevent proper contact.

2. Clean the charging contacts: use a dry cloth or cotton swab with a small amount of alcohol to clean the charging contacts on the earbuds and in the charging case.

3. Check the case battery: when the charging case battery is below 5%, it may no longer be able to charge the earbuds. Charge the case first, then try charging the earbuds again.

4. Check the indicator for contact: each time you place the earbuds in the case, check the indicator to confirm the connection. A white light indicates normal contact, while a yellow light indicates poor contact.

If the earbuds cannot charge, stay connected to the device after being placed back in the case, or do not turn on when taken out of the case, try the following:

1. Re-seat the earbuds: take the earbuds out and place them back in the case. Then close the lid and fully slide the charging case open before taking the earbuds out and trying again.  Please note: if the charging case is not fully opened, the earbuds may not power on.

2. Check installation and connection: make sure the ear tips and ear wings are installed properly and do not block the charging contacts on the earbuds or in the case. After placing both earbuds in the case, the case indicator should light up white, indicating a proper connection.

3. Clean the charging contacts: use a dry cloth or cotton swab with a small amount of alcohol to clean the charging contacts in the case and on the earbuds to ensure proper contact.

4. Try different charging accessories: use a different charging cable and charger to charge the case, and make sure the case has sufficient battery power.

Notes: If the earbuds have not been used for a long time, charge them for at least 2 hours first, then check whether the issue is resolved.

If you need further assistance, please reach out through the official support channel.