Increases Iung CapacityIt can increase lung capacity, promotes gas exchange can effectively improve your lung breathability, reduces breathing difficulties, prevents recurrent infections, and improves the quality of life. Easy to Carryyou can use this lung health device anywhere. Most just need to use it once or twice a day for one to five minutes. Easy to use for all ages. Trained in StagesTrusted OPEP therapy loosen and remove mucus from the airway. Three different sizes of balls, which can be trained in stages and gradually improved, you can adjust the pressure depending on your lung capacity, age, and current health. Easy to CleanTurn the lid counterclockwise to open the breathing trainer, you can replace different size steel balls according to the exercise. Cleaning steps: First open the lid to disassemble the breathing trainer. Then use soapy water or detergent to clean thoroughly. After drying, you can use it again. To avoid cross-contamination, a breathing trainer can only be used by one person. Worry-Free Shopping Experience We are committed to providing consumers with healthy products and perfect service. Please feel free to contact us with any questions about the product, if you are not satisfied with our products, we guarantee to provide a 100% refund.