Why are my earbuds unable to change when placed in the charging case?

Use Ear (stick) where the ambient temperature is between 0º and 45º C. Low or high temperature conditions might cause the device to change its behaviour. If the interior temperature of the device exceeds the normal operating range, the device will protect its internal components by attempting to regulate its temperature. If this happens, charging might slow or stop. Please bring the device back to regular ambient temperatures and try charging again.