1. Promote metabolism.Through the increase of lung capacity, it can make the exchange of blood and oxygen in the body more rapid, which has a promotion effect on the patient's metabolism, discharging metabolic substances in the body, which is more conducive to the health of the body. 2. Enhance lung function.The increase in lung capacity can be in the process of strenuous exercise, inhale several times as well as a dozen times more oxygen than normal, however, in the quiet time the alveoli began to work to improve the ventilation of the alveoli, thus enhancing lung function. 3. Improves heart and brain function.Higher lung capacity is good for the body as it increases the oxygen supply and can improve the heart and brain function to maintain the mental and emotional state at a better level. Color: Black & Gray Material: plastic Package Contents: 1 x Lung Breath Trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.