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Notes:●The product cannot produce oxygen, cannot be used in an environment with oxygen concentration less than 19.5%, cannot be modified, cleaned, abused or misused, and cannot be used when facial whiskers, hair or other conditions affect the tightness between the face and the respirator seal.●When the filter cotton is dirty or damaged, or when you feel significant increase in respiratory resistance, please replace the filter cotton in time.●The time to abolish the filter cotton: When the cumulative use time of the filter cotton reached 40 hours, or began to use up to 30 days, whichever is earlier.