THE FIRST DEVICE CAN ADJUST VALVE HOLE ON AMAZON: The lung expander are designed to settle choke valve loose or tight by turning top cover. If you’re new to use it or your lung capacity is weak at first , you can turn the valve hole loose to reduce resistance. After lung capacity increased,the valve hole can be slowly turned tight to increase resistance to strength the lung.
UNBLOCKED AIRWAYS: It’s used to help loosen the mucus and clear congestion from airway, so you can cough it out naturally
DRUG-FREE TREATMENT- The lung exerciser is used by those affected by Asthma,Hypertension,Bronchiectasis,Atelectasis,Chronic Bronchitis.Long-term use can assist in increasing lung capacity and open blocked airways, has proven to improve performance of expiratory Muscles.