The balanced diaphragm R1000 first stage is compact and lightweight.  It has a full complement of four low-pressure and two high-pressure ports and is fine- tuned for optimum performance.
The S0001 second stage features a venturi adjustment lever to deliver air smoothly with each breath. The S0001 is also equipped with an ortho-consciously designed mouthpiece to increase comfort and reduce jaw fatigue. The S0001 allows for left or right hand configuration.