The AirSep Freestyle 5 is a wearable portable concentrator that offers 5 different pulse setting and ensures that you can have the total access you need in a compact, lightweight, portable concentrator. This is a very long-lasting, sturdy and dependable portable oxygen concentrator, at only 6.2 lbs. It's also very low-maintenance. Besides periodically cleaning or replacing the intake filter to make sure you are always getting the cleanest and purest oxygen, you won't need to do any major maintenance or have it repaired for years to come. A wipe down with a lint-free cloth is something you should do now and then to keep the outside clean, and keeping it inside the case will also keep it free of dust and anything else that can make the outside of the concentrator dirty.