Globally Trusted (PEP) - Mucus breathing remover is scientific, therapeutic by exercise improve lung capacity and expands airway to loosen mucus discharge physio methods. Indicated for the treatment of asthma, bronchitis, cystic fibrosis, and mucus drainage. Particularly helpful for swimmers, athletes, singers, and wind instrument musicians. Method Of Use - Handheld lung exerciser aids, you can control the horizontal height of the ball in it to adjust it for the best vibration effect. There are two different sizes of balls to choose from. The weight of the ball affects the ease of exhalation and thus the degree of vibration of the lungs, vibrating the airway to loosen the mucus from the airway walls and expel it. You will feel a noticeable feeling of vibration in your chest if you use the device in the right way. Suitable For - Most people need only 5-15 minutes, once or twice a day, long-time use will help to develop better breathing for patients with mucus-producing.Children and adults, including the elderly, smokers, swimmers, athletes, singers, and wind instrument musicians.