The flutter mucus clearance device helps you learn to create positive air pressure to force out mucus. The FLUTTER provides positive expiratory pressure therapy (PEP therapy) for patients with mucus-producing repiratory conditions including: Atelectasis Bronchitis Bronchiectasis Cystic Fibrosis Chronic Obstructive Pulmonary Diseases (COPDs), such as asthma Other conditions producing retained secretions. The Flutter Mucus Clearance Device comes with an instructional video cassette that is almost 7 minutes long. The video shows you how to get the most out of your PET Therapy.