Thank you for your suggestion. To clarify, my pulmonologist recommended the Brand and Model of my machine after reviewing the results of my sleep study. Unfortunately, the DME company she forwarded the order to for the machine and later follow-up overnight pulse oximetry after initial adjustment period with CPAP in place, replacement mask, etc. have been difficult to coordinate. Again, BBB have rated this company with a “F” score in the State of Florida. My pulmonologist adjusts pressure at my follow-up appointment.