BiPAP®Pro 2 with Bi-Flex® "softens" the airflow in inhalation and exhalation, making breathing more natural - and unbelievable more comfortable - for patients. In the Bi-Flex mode, the amount of pressure relief at the end of inhalation and at the beginning of exhalation is established. Patient-adjustable settings of "1", "2" or "3" provide pregressively increased pressure relief.