Description: 【Lung Capacity Exercise】: Breathing exerciser device can increase lung strength and capacity, effectively exercise respiratory muscle and quickly increase your breath endurance. 【Qaulity Material】: Breathing exercise device made of PC and ABS material, flexible and soft, comfortable enough for long time bite training. 【Easy to Use】: LED display screen, real time read, help you assess whether your lung function is normal, 【Portable】: Lightweight,  and easy to carry, Lung exerciser device can be used at home or on the go.   【Professional】: Designed for improving your lung capacity with our breathing exerciser, you can easily practice deep breathing anytime, making it a great addition to your daily routine. Suitable for beginner, kids and music learner Specification: Material: PC ABS   Size Chart: LxW: 13.4cmx3cm/5.28inchx1.18inch Package Includes: 1 Breathing Training Device 2 Mounthpieces 1 Training Mounthpiece 1 Cable 1 Manual