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When breathing, the shape and contour of the human body will change with the exchange of airflow inside and outside the body. Strengthen respiratory muscles, increase lung ventilation, improve coughing ability, reduce postoperative complications, and prevent atelectasis. To help strengthen the respiratory muscles by slowly breathing deeply, the patient slowly sucks the sphere, allowing the two rib muscles to expand the chest wall for better expansion, preventing alveolar collapse, increasing lung ventilation, and increasing lung capacity to enhance lung expansion and coughing ability to prevent sputum accumulation. Product name: Breathing Trainer Inspiratory flow rate scale indication: 600cc / sec, 900cc / seC, 1200cc / sec. Color: as shown Material: pc packing list: 1X suction volume main chamber (600ml / sec.900ml / sec1200ml / sec) 1XEVA extension tube 1XPP mouthpiece 1XABS indicator ball