Portable Lung Muscle Trainer Convenient Respiratory Training Device Visual Reading of Lung Capacity Exercise Breathing Trainer

​​Features: Long press to turn on/off, easy to operate, easy to turn on Direct reading, clear display Help you ease your emotions and calm yourself down Increase lung muscles to help improve lung health Specification: Material: Aluminium+Plastic Color: Black,Blue Battery: 320mAh Size: 138*22*12mm Division value: 1ml Note: Please allow 1-2cm differences due to manual measurement. Due to the difference between different monitors,the picture may not reflect the actual color of the item. Thank you! Package Included: 1pc x Breathing Trainer 3pcs x Mouthpiece 1pc x USB cable 1pc x Manual Packed Safely in Retail Box.