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FEATURES: 1.It also improves lung capacity for people that don't have mucus. 2.Regular exercises help you open block airways and remove mucus, improve your lung capacity and get you great sleep. 3.Easy to assemble, please follow the instruction to have your improving lung capacity trip. 4.Made of high quality material and last long . 5.It's suggested to use it by proper posture, please follow the instruction. 6.It's recommended to do regular exercises with this device. NOTE: It's a not a inhaler, it produces a positive pressure and help you open your airways when you exhaling.