1Used for storage and transportation of oxygen, timely oxygen supply. 2Made of quality aluminum alloy material, safe and eco-friendly, sturdy and durable. 32L large capacity, enough to satisfy oxygen supply demand, suitable for both home care and hospital use. 4Suitable for different kinds of people such as the elderly, patients, pregnant women and people who travel on high mountains and plateaus. 5Light weight and in small size, easy to carry, especially suitable for travel use.