Product Function      Clear retained sputum        Relieve difficulty in expectoration        Improve airway drainage        Dilate the airway        Increase pulmonary capacity           Prevent white lung        Reduce postoperative pulmonary complications        Alleviates symptoms in patients with asthma and COPD               Ease breathlessness        Increase pulmonary capacity        Strengthen respiratory muscles         Improve sputum expectoration ability        Enhance cardiopulmonary function