The pneumatically balanced demand valve along with a highly responsive design allows this regulator to provide a high volume of airflow with even the slightest inhalation effort, making it seem nearly effortless to breathe at any depth. All in a second stage barely wider than the mouthpiece? The ION means business as it comes equipped for any type of dive conditions, cold or warm. Following the rules of the sea, or should we say the rules of the C: Compact - Comfortable - Customizable; the ION is a diver"s dream. Pneumatically balanced second stage with virtually no breathing effort Patented Dynamic Adjustment automatically maintains inhalation effort throughout the dive Adjustable venturi switch for dive/pre-dive adjustment Inline swivel for increased comfort and reduced jaw fatigue Nitrox compatible to 40% Patented orthodontic mouthpiece with high density bite tabs Rugged, lightweight 5.4 ounce second stage with extremely small 2.3Ã"Â" wide outer ring AT400 First Stage High performance over-balanced diaphragm first stage with environmental seal and the added protection of DVT (Dry Valve Technology). 4 LP ports, 2 HP ports for maximum hose placement DVT eliminates corrosion of critical internal components, bacteria, hose deterioration, and damaged gauges and computers. Nitrox compatible to 40% Dry Environmental Protection Kit