The Philips-Respironics "System One" BiPAP Pro with Bi-Flex takes a smarter approach to the entire sleep management process. New features such as resistance control, advanced event detection, upgraded data management and reporting, and Bi-Flex put this CPAP machine on the cutting edge. Bi-Flex pressure relief technology offers pressure relief at inhalation and exhalation to make BiPAP therapy more like natural breathing. By tracking each breath, Bi-Flex pressure relief technology delivers pressure relief at three critical points in the breathing cycle: 1.the transition from exhalation to inhalation 2.the transition from inhalation to exhalation 3.during exhalation The System One resistance control allows the patient to tell the machine what type of mask you are using such as a nasal, full face, or nasal pillow. The machine then makes adjustments for optimal flow depending on your mask. Each Respironics mask will now come with a resistance control setting letting you know how to set your machine to match your mask. Philips-Respironics has upgraded their event detection algorithm to include data on Snoring, Periodic Breathing (PB), Respiratory Effort-Related Arousals (RERAs), Apnea Hypopnea Index (AHI), leak, Clear Airway Apnea (CA), Obstructed Airway Apnea (OA), and Hypopnea (HY). The BiPAP Pro will also record Patterns of use and Flow waveform data. With this information, your physician will be able to better determine the best possible solutions for your sleep therapy. The PR System One uses a SD card for data collection. Prior to the System One, patients were required to use a specialized card reader when uploading sleep data to a computer. Philips-Respironics has made this process easier by using the standard SD card, giving the patient the ability to use any SD reader to upload sleep data.