After thoughts, yes a little slow now days on them LOL. here is the thoughts that you might like to check out for use of a POC.
1) FAA approved? Just in case you would like to use on an airplane
2) Up to what Liter of O2 will it pump? Need to at least over your needs maybe a liter more for higher elevations (check with doc of course)
3) Battery life - meaning at the rate you need, how long will the battery last about?
4) Can you get a back up battery with it, need more battery time while in use of course 😀
5) How does the unit / battery charge? Wall, Car, USB port, External charger?
6) Can you use the POC while it is charging?
7) Can you use the POC with out a battery, but plugged in?
😎 How long of a hose can be used with the POC, 10 ft, 25 ft etc.. This could be useful when using the POC at night, keeping it plugged in and a little ways a way from you so you will not hear it was well or the nearest plug in is across the room from the bed.
Ok I think that is it for now, if I think of anything else I will come and add. Hopefully this will get you started on some things to ask though to for it's all about knowledge and what it is going to be used for.
Excited for you to gain some of your independence back, so worth it!