SmartRamp Gradually achieves prescribed therapy level allowing patient to fall asleep at lower pressure. C-Flex gives pressure relief at exhalation, pressure is lowered based on breath-per-breath analysis and provides pressure relief during exhalation based on expiratory flow & minimizes pressure transition providing comfort when in fixed-CPAP mode. Mask Fit Check displays if leaks are detected in the mask. Change filter alerts. Auto On/Off. DreamStation APAP can detect if user mask is off or on and begins or stops therapy accordingly, if enabled. FAA Approved & Travel Friendly: W/o humidifier it weighs 3 lbs. DC power cord and battery options available. Latex Free #DSX700H11W-w/Humidifier #DSX700T11W-w/Humidifier & Heated Tube UNSPSC#44272202