VIEW THE LAST 5 VITAL CAPACITY HISTORICAL DATA - If you are fouse on health, this is something you need.With a long time exhalation exercise,It regulates your breath, your heart rate, , anxiety, sleep,etc. PERSONAL POCKET BREATHING TRAINING DEVICE - Weighs only 1 oz/28.8g.Compact design, easy to carry and exercises when and where you want. BREATHING EXERCISE DEVICE - Perfect for sportsperson and athletes who wants to improve performance, people who wants to improve wellbeing.It is recommended to use for 5-10 minutes a day, training with 3-5 groups every day, and then increase intensity according to your own situation. IMPROVE BREATHING INTENSITY - Training your breathing muscles.Predominantly the diaphragm, can extend their time to fatigue, thereby prolonging the oxygen supply time of the muscles during exercise.Have a light effect progress bar to increase the fun of breathing training. EASILY BREATHING EXERCISE - Simple product have only one moving part, increase the resistance of breathing muscles to improve efficiency and endurance.Most users are improved after 45-60 days through the correct training.