The SimplyGo is a new class of portable oxygen concentrators; it is lightweight, compact, and easy to use. With its high restraint design, oversized cart wheels, and long life compressor the SimplyGo was built for reliable performance from day to day for the most active of users. During development, the SimplyGo was tested and subjected to extreme impacts, vibrations, and temperatures making the SimplyGo one of the most reliable portable oxygen concentrators on the market giving new meaning to ruggedness. Only used twice for a total of under 12 hours.