This machine was my dad's and he never used it. It is in perfect working order and is very clean. From the RESMED website: AirCurve™ 10 bilevel machines include two pressure level settings: a higher pressure when you inhale, and a lower pressure that makes it easier to exhale. Each machine also gives you access to myAir™ – a free app that provides a nightly sleep score, coaching and more to help you stay on track1. AirCurve 10 machines provide enhanced settings designed to make sleep apnea treatment more comfortable. Each model also offers myAir access to help you stay on track throughout your sleep apnea treatment journey. Allows your exhalation pressure to be set as low as 4 cm H2O for enhanced breathing comfort, regardless of how high the inhalation pressure is set. This can be helpful if you require a higher pressure to treat your sleep apnea. Built-in humidifier and Climate Control’s enhanced Auto setting provide optimal breathing comfort3. User-friendly controls and an intuitive interface make it simple to navigate settings and your nightly sleep report. Please note, returns will not be accepted. Even though this is brand new/never used - I am selling this item in "as is" condition because it is a medical device. No tubing or masks are included. New/unused water tank is included. Power supply is included. Carry bag included. Please reach out to me with questions prior to purchase. Thank you!