1. Globally trusted (PEP) sputum excretion respirator: Through scientific exercise and treatment methods, it can increase lung capacity and expand the airways, and loosen and expel sputum physically. It is suitable for the treatment of asthma, bronchitis, cystic fibrosis, and sputum drainage. It is particularly helpful for swimmers, athletes, singers, and wind instrument players. 2. Usage method: This handheld lung exercise aid allows you to control the horizontal height of the small balls inside to adjust and achieve the best vibration effect. There are two different sizes of small balls to choose from. The weight of the small balls will affect the difficulty of exhalation, which in turn affects the degree of lung vibration. The vibration of the airways can loosen the sputum from the airway walls and expel it. If used correctly, you will clearly feel the vibration in your chest. 3. Suitable population: Most people use it 1 - 2 times a day, and each time only takes 5 - 15 minutes. Long - term use helps patients who produce sputum develop better breathing habits. It is suitable for both children and adults, including the elderly, smokers, swimmers, athletes, singers, and wind instrument players.