1REMOVE MUCUS: In line with the oral airflow difference, more convenient sputum discharge, assists in relaxing and removing mucus from the airway. 2VIBRATION: By blowing, the PEP and gas vibrate at a frequency that resonates with the frequency of the human lungs. The shock of tracheal PEP is discharged to loosen sputum in the airway wall, intermittently increase the intrabronchial pressure, and maintain airway release during exhalation to ensure sputum rise. 3LUNG CARE: The lung exerciser can strengthen your respiratory muscles and abdomen to improve your lung capacity and performance, exercises lung muscles. 4BREATHING EASIER:The lung exerciser for better breathing and enhancing lung capacity, improve respiratory issues, strengthen exhalation muscles. 5APPLICATION: Suitable for adults, elderly, children, vapers, swimmers, deep sea divers, athletes, singers,wind instrument musicians, smokers lung cleanse