Took over a month to get here even though I was told 2-6 days for delivery after I paid in full. That’s no big deal, I’m patient. Unit shows up and after I installed everything I find that it doesn’t deliver any oxygen.. I’m really disappointed. I planned on buying several of these units to start my own business but I’m second guessing everything now. I guess I’m in another waiting period to see if they do anything at all to resolve the problem.