This is the Aqua Lung Helix Compact Regulator 1st and 2nd Stages First Stage Travel-Ready: the reduced size and weight makes the Helix Compact the ideal choice for travelers Yoke or DIN: available in yoke (3,300psi/232 bar max.) or DIN (4,350psi/300 bar max.) HP/MP Ports and "T" Shape: 2 HP ports (7/16") and 4 MP ports (3/8"), perfectly oriented in a "T" shape for streamlined hose positioning, reduced exhalation effort, and sending bubbles out of your field of view Braided Hose: A braided hose provides flexibility, comfort and excellent transportability Standard Aqualung Parts: since it uses standard Aqualung components, your local dive shop can more easily service it Second Stage Pneumatically Balanced: Pneumatically balanced for smooth, easy breathing Comfo-Bite: Comfo-Bite mouthpiece is soft yet sturdy and reduces jaw fatigue with its unique palate bridge Optimize Your Opening Effort: With the "Mini/Maxi" adjustment knob, you can increase the opening effort, ideal for avoiding freeflow at the surface, or lower the inhalation effort, reducing the work of breathing Something so small and light, you&&';;d hardly notice it&&';;s there that was the goal that led to the new Helix Compact. This regulator is designed for anyone looking to save space while maintaining the advantages of a full-sized regulator. It offers unparalleled comfort, breathing ease, and function in a travel-sized package.