The Respironics REMstar Auto System is a CPAP (Continuous Positive Airway Pressure) device designed for the treatment of adult Obstructive Sleep Apnea (OSA). The system can deliver CPAP therapy or Auto-CPAP therapy. When set in the Auto-CPAP mode, the system will monitor your breathing as you sleep and automatically adjust the pressure to meet your needs. When in the CPAP mode, the system will deliver a continuous, set pressure during the night.