Handy Oxygen Concentrator

The advent of technology has apparently made our lives easier and smoother. To my surprise and amazement, one can now breathe from a moving oxygen. The portable oxygen concentrator is a gadget that can be transported anywhere. This is best for those who are undergoing oxygen therapy. I just do not know if it works with people who have asthma like me. I have a nebulizer though which is very handy and it's the only thing that can relieve me of if I get asthma attacks.