Description: Helps you breathe correctly, train you to take deep breaths, help you open and clear your airways, helps prevent upper respiratory tract diseases such as mucus accumulation, asthma, etc. The more breathing exercises performed properly, the more efficiently the lungs deliver oxygen to the entire body, not only strengthen the respiratory system, but also prevent lung diseases. Easy to use. Your goal is to take a deep breath and float the colored balls in each column, green means you inhale 600 ml / ml, red means 900 ml/ml, yellow means 1200 ml/ml, , plus 2700 ml.You can measure and record the maximum inhalation effort. It also helps fight stress and anxiety. When you take a deep breath, it will also clear your mind and get rid of the stress and anxiety caused by daily work and activities. You can easily spend the day actively and positively. Lightweight to carry and clean, easy to put in a bag and carry it with you. You can use it at home, A simple exercise can keep your lungs healthy. Specification: Name: Breathing Trainer Material: PVC Size for 3 Balls Style: 13.7x6.5x16.3cm Size for 4 Balls Style: 14.5x13x7cm Package Includes:(2 Pack) 1x Breathing Exerciser 1x English manual