Drug-Free Independent Therapy Mucus Remover- Applied OPEP, globally trusted therapy. Continued use can help loosen phlegm and promote coughing to better remove mucus.Effective For Many Respiratory Conditions - This lung cleaner is an invaluable tool for anyone suffering from respiratory issues, used for Asthma, Atelectasis, Bronchitis, Cystic Fibrosis, etc.Universal For Most Users - Our breathing aids come with 1 Stainless Steel Ball Bearings so that you can adjust to Minimal or Maximum Positive Pressure depending on your lung capacity, age, and current health.Quick Easy To Use - Our mucus clearing device is simple in design and requires no refills no batteries, easy to use and clean. Use it for just 5 - 10 minutes once or twice a day.Designed To Help Train Lungs - This lung exerciser device can facilitate gas exchange, improve lung strength, reduce breathlessness, and improve quality of life. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store