Note:Some photos may slightly differ from actual items in terms of color due to lighting during photo shoot and/or monitor display. 1200ML large capacity medical oxygen. Fresh and natural. Health and Environmental Protection. Portable oxygen supplement, multi-way available. Suitable for pregnant women, middle-aged and elderly people, families, outdoor travel, altitude sickness, high stress and other hypoxic people. Hypoxia in the second trimester of pregnancy. Elderly standing,High altitude travel hypoxia,Long-term mental workers.