An oxygen concentrator is a medical device used to deliver oxygen to those who require it. People may require it if they have a condition that causes or results in low levels of oxygen in their blood. These oxygen concentrators are obtained via prescription and therefore cannot be purchased over the counter. Oxygen concentrators are powered by plugging in to an electrical outlet. The oxygen concentrator filters room air to produce air with up to 95% oxygen and has the ability to run 24 hours a day.A&P Quality Care Medical follows the manufacturer’s guidelines for maintenance and service.