Profile: American Medical Sales & Repair specializes in providing oxygen concentrators. Our portable oxygen concentrator is typically intended for short-term usage. It is provided with a portable oxygen tank. Portable oxygen concentrators are designed to be much smaller and lighter than a stationary oxygen concentrator. They provide oxygen when plugged into a wall outlet or a DC converter for use and charging while driving in a car. We carry eight models of portable oxygen concentrators, all with different specifications.