3-Ball Deep Breathing Exerciser Capacity Training Device Incentive Spirometer Spirometry Breath Exercises and Measurements-Good Features: It also helps fight stress and an-xiety. When you take a deep breath, it will also clear your mind and get rid of the stress and an-xiety caused by daily work and activities. You can easily spend the day actively and positively. 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, You can measure and record the maximum inhalation effort. Easy to use, 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 healthy. Helps you breathe correctly, train you to take deep breaths, help you open and clear your airways, helps protect upper respiratory tract for health. The more breathing exercises performed properly, the more efficiently deliver oxygen to the entire body, not only strengthen the respiratory system, but also protect for health. Specification: Style: three balls Material: ABS Color: As picture shown Size:app. 24x4cm/8.27x1.57in Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Deep Breathing Exerciser(other accessories demo in the picture is not included.)