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: the transition from exhalation to inhalation, the transition from inhalation to exhalation and during exhalation. The BiPAP Pro Bi-Flex offers two therapies: Bi-Level and Bi-Level with Bi-Flex and may offer CPAP and CPAP with C-Flex. The BiPAP Bi-Flex is used to treat Obstructive Sleep Apnea. System One Humidity Control has been designed to establish optimum patient comfort and device performance. For additional comfort, System One now has improved absolute humidity and target relative humidity levels across all humidifier dial settings. In addition, a new “classic” mode provides the ability to shut off humidity control. Even in changing environmental conditions, consistent humidification levels are preserved throughout each night. System One closely monitors room temperature, room humidity, and flow to determine what is required to maintain the patient-selected humidity level. By controlling relative humidity output at the mask, rainout can be prevented, under most circumstances. Through a combination of our cleverly-designed water chamber plus the advanced Dry Box design, the risk of water ingress into the device is virtually eliminated. Even when fully filled, to the fill line, the water chamber can be tilted or turned upside-down without leaking back into the device. Should any water manage to escape the chamber, the Dry Box prevents it from entering the device. Digital Auto-Track Sensitivity is the brains behind all Flex Family pressure relief technologies. Digital Auto-Trak is a highly sensitive algorithm that tracks each breath and detects the onset of inspiration and expiration – even in the presence of mask leak. It then responds by triggering the machine to provide an adaptive pressure relief right when the patient needs it. Delivering the right level of pressure relief when patients need it makes therapy more natural – and more comfortable.