The WellO2 breathing regulator is a spare part for the WellO2 steam breathing trainer. With the WellO2 breathing regulator, you can adjust the resistance of the breathing exercise steplessly between the levels. Resistance levels: Resistance level 0: 15 cmH2OResistance level 1: 30 cmH2OResistance level 2: 65 cmH2OResistance level 3: 120 cmH2O Start WellO2 training with the lowest resistance level and adjust it based on your progress and personal preferences. We recommend replacing the breathing regulator in the WellO2 steam breathing trainer once a year if you use the device regularly twice a day. The strength of the regulator's resistance may decrease over time. By regularly replacing the breathing regulator, you ensure that the resistance remains effective, providing you with an efficient workout. Note! The breathing regulator is included in the package of WellO2 Steam Breathing Trainer. Technical Specifications Material: Tritan Country of manufacture: China Designed in Finland.