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. 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.