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. 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.