An oxygen concentrator is a medical device used to deliver oxygen to those who require it. Oxygen concentrators are powered by plugging in to an electrical outlet or by battery. A concentrator filters in air, compresses it, and delivers air continuously. The air supply will never run out. Instead of refilling compressed air, the concentrator just needs access to power.
Oxygen concentrators are safe, consistent, affordable, and compact unlike oxygen tanks. The freedom to a patient to move around easily is a huge benefit to anyone suffering from post-COVID breathing issues, COPD or any respiratory illness.