First Stage. DFC (patented) Dynamic Flow Control system controls air flow for consistent breathability at all depths by maintaining the intermediate first stage working pressure. First stage has 6 ports; 4 low-pressure and 2 high-pressure. Comfort grip knob on first stage yoke Balanced diaphragm designed for consistent performance at depth. Port system optimally pre-oriented. Body is made of high-strength nickel and chrome-plated brass with a matte satin-finish surface. Second Stage. TEC - System (patented) Trim Efficiency Control - The TEC is a control system that increases the air flow to the diver as needed for natural breathability. This is done by regulating air flow and volume by an air directional trim lever in the mouthpiece. The trim lever also optimizes the exhalation cycle by reducing resistance. Bypass System (patented) - with built-in high flow air control tube molded into the second stage housing - lightweight compact streamlined design. Exhaust port located opposite the hose for left and/or right hand air delivery, making it ideal for buddy breathing. Mesh Regulator Top Cover (patented) - Hydrodynamic top cover design to minimize water flow characteristics and reduce freeflow potential. Certified to the EC Mark, Reference standard UNI-EN 250.