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. The RS1001 offers the following Features:Ideal For Cold Water Environments:The cold water ready feature enables the regulator to be used in waters below 50F /10C tested to a temperature of 39F / 4C.Ortho-Consciously Designed Mouth Piece:The new mouth piece, developed on the basis of ergonomic engineering, further enhances the comfort of bite, fit, and stability. Even with a light bite, a high level of stability is achieved, so there is no fatigue from long periods of usage.The RS1001 is available as RS1001 DIN (300bar/4350psi).Features:First stage (R1000):Balanced diaphragm first stageCold water insulation systemTwo H.P. ports and four L.P. ports (2 standard/2 high flow) portsHigh flow L.P. ports offer up to 15% increase in air flowDIN version available as RS1001 DIN (300bar/4350psi)Second stage (S0001):Lightweight, compact composite case designLeft or Right hand configurationVenturi adjustment leverOrtho-consciously designed mouth pieceTechnology:ORTHO-CONSCIOUS MOUTH PIECE: The Ortho-Conscious Mouth Piece feature prevents jaw fatigue. The ridges and flexible material allow the diver to have more control of the mouth piece and reduces tension in the jaw. Read moreVENTURI FLOW ADJUSTMENT: The Venturi Flow Adjustment allows for ease of breathing by controlling the direction of air through the mouthpiece.