The ResMed VPAP Auto 25 BiLevel System features three unique modes (VAuto, S and CPAP), which makes this machine the most versatile device available in today's marketplace. The VPAP unit comes with a redesigned motor which offers superior performance while significantly reducing noise levels. ResMed's AutoSet technology is designed to automatically adjust to the patient's various pressure requirements throughout the night (adjusting pressures for both inspiration, or IPAP, and for expiration, or EPAP). Available with or without Heated Humidifier.