Overall good product. Things came as described and on time.
The unit works well a helps my breathing
Needed something when my dad oxygen levels were low but wouldn't go to hospital because he was EOL and covid restrictions, this made a notable improvement to his o2 levels and made him more comfortable.
My mum came out of hospital panicking about not having oxygen. So, this isn't the same as an oxygen tank (prospective buyers, DO do your homework on what these are), but it does safely increase the oxygen level a fraction to help with COPD.
Great product, saved my uncle's life when he got a heart attack one night, before the ambulance arrived.