A) Please ensure to remove the protective film from the charging contacts of the ear buds.
B) If device is not charged from very long time, then ensure to keep the device on charging for 1 hour
C) Please make sure that the charging case lid is closed after putting the ear buds inside the charging case
D) Ensure that charging case lid is blinking when ear buds are charging inside the charging.
E) Charging case battery should be charged. In case charging case is not charged then ear buds will not get charge