Feature:1. Improve Lung Capacity: Breathing exercise device increases lung capacity, promotes gas exchange, reduces breathing difficulties, prevents recurrent infections.2. Reduce Fatigue: Breathing exerciser helps you improve performance in sports and other aerobic activities while speeding up recovery and reducing fatigue time.3. Principle: Breathing lung trainer combines positive breath pressure with airway vibration to help mobilize lung secretions and improve your lung function.4. Daily Use: Lung breathing exerciser is the perfect solution for long term breathing problems, you only need to use 510 minutes once or twice a day for breath recovery.5. ABS Alloy: Handheld breathing exerciser is made of ABS and alloy materials, safe and sturdy, which can effectively improving your breathing, good for lung health.Specification:Item Type: Breathing ExerciserMaterial: ABS, AlloyFunction: Breathing training.Package List:1 xBreathing Exerciser