#Kay83, hi! I use 3L oxygen for exercising and sleeping at night only. My pulmonologist at Univ. of Chicago ordered an Inogen portable personal concentrator for exericising and I also received the larger plug in concentrator for nighttime use. Medicare pays for the machines, I have had good results working directly with Inogen since 2020. I just have to be tested by my pulmonologist every 5 years to get updated equipment. Inogen provides repairs, regular maintenance items, nasal cannuals, a 24/7 emergency phone number. These only provide up to a limited amount of oxygen, mine I have right now go to 5L. I can use the portable one at the gym while working out. Your doctor may have the best suggestions for you. Hope you are able to find what works best for you!!

Yes, weight is one of the units selling points. Also, how long a battery charge lasts, and cost,and how much oxygen it produces. if insurance will cover, I just started looking into them myself. I use a compressor and tanks now in rehab but will be going home with an oxygen devices when released.

So, this is only my opinion from my experience with three different machines. The first, was sent back twice for not working, overheating and such, the second just stopped working, and the third that was brand new and I had about 6 Mos or so stopped taking a charge. Im officially done with them. They weigh about as much as a tank, not reliable in my opinion, I still had to make sure I had tanks with me. At least with tanks I know how much time to expect with them and no recharging. Oh, and I had three different name brands. Hope you have better luck thanI did if you choose to try one.