(THIS PRODUCT IS CURRENTLY UNAVAILABLE FOR SALE) The PR System One REMStar 60 Series Auto CPAP Machine has all the best features of the original PR System One REMstar Auto CPAP Machine with A-Flex. Select the OPTIONAL cutting edge and responsive heated tube and humidifier system for increased therapy comfort. Philips Respironics builds on their ground breaking System One Humidity Control, the first technology to consider the ambient humidity in the room, by adding a Heated Tube. Set the humidification to the desired level and it will be maintained all the way from the machine to the mask reducing rainout.