Auto-Trial mode delivers breath-by-breath auto-CPAP therapy for up to a total of 30 days, after which the device automatically transitions into the CPAP-Check mode at the pressure the patient was at or below 90% of the trial period time. CPAP-Check mode checks on the user every 30 hours to determine if therapy pressure is optimal. If it is not optimal, it automatically adjusts the nightly fixed CPAP pressure by 1 cm H2O to obtain ideal pressure. Adjustable PSmin provides clinicians with additional options for patients who require auto bi-level therapy Heated tube for more flexibility and patient comfort.