Oxygen is the most needed compound in the human body. We can go several weeks without food and several days without water, but only precious secondswithout oxygen. We need oxygen to survive, not only is poor quality oxygen full of toxins but low oxygen in the body allows bacteria, virus, fungi and micro-organisms to flourish. Our bodies need the correct levels of fresh oxygen to remain healthy and fight back against these organisms. 30% of oxygen concentration is the most suitable and safe for human body. In medical arena 30% oxygen concentrator is called rich oxygen and also the life oxygen. If we live under this oxygen environment, our physical strength muscle energy, cerebrum intelligence and blood oxygen concentration will be in the best condition. Increased oxygen intake helps with increase energy levels, release stress & anxiety, detoxifying the blood, improves brain function and boosts the immune system. This portable oxygen concentrator can raise oxygen level from 21% to approximately 30%, It Greatly Improves Body Functions Thus Helping You Achieve A Healthier Well-Being. This device is basically maintenance-free and is very safe and easy to use. The unit is an electrically powered device that separates oxygen from the room air, concentrates and delivers it at your prescribed rate and due to this technology, never needs re-filling. This system is less expensive than liquid oxygen and eliminates the need for re-supply of oxygen cylinders.