This is a Voyager Pro Octo 2nd Stage. This super 2nd Stage Regulator features: Voyager PRO series 2nd Stage Mechanically balanced for smooth and easy inhalation/exhalation Features an under-chin exhaust, directing bubbles to the sides External air intake resistance adjustment system Internal air deflector for smooth and easy breathing Lightweight and compact Weights a mere 5.8 oz without the hose Electro less nickel plated brass Light weight helps prevent jaw fatigue during those long dives Large diameter exhaust valve allows for proper removal of exhaled air Get the same quality gear without paying the retail price. Afford to dive.