Oxygen Concentrator 1-7L with Nebulizer for Home use For Patients with Respiratory diseases, cardio-cerebrovascular disease, and healthy person in high altitude areas with thin air, middle-aged, elderly people, pregnant women, students who engage in mental work for extended periods and other people who suffer different degrees of physiological hypoxia. It can also eliminate fatigue and restore somatic function after heavy physical or mental exertion. It can also be used by workers who are overworked and exhausted from oxygen supply Key Features:::: - Delivery 93% ±3% Medical Grade Oxygen purity levels; - 1-7 grade flow setting; - Nebulization Available - Easy to operate LCD display; - With a water cup, make the air moist, - With timing function, - Quiet, sound level ≤50DB