In my last post I mentioned I had to wait for a portable concentrator. I thankfully had a lot of help in researching & deciding on one too, although part of the decision was based on what my oxygen supplier stocked. There is a wait list since these are somewhat personalized machines, it depends on how much oxygen one uses and if the person need intermittent (pulse-dosing) or continuous & high pulse. There are many to choose from but it’s a completely individual choice depending on what it’s use is, what the battery life is, & what the flow settings are.