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 three 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.