Features: 1Keep Your Lungs Healthy: This is what respiratory trainers provide. Regular breathing exercises not only strengthen your respiratory system, but also prevent lung disease. 2Help You Breathe Properly: Train you to take deep breaths to help open and clear your airways. In turn, this helps prevent upper respiratory diseases such as mucus buildup, asthma, pneumonia, etc. 3Easy To Use: Your goal is to breathe deeply and float the colored balls in each column. Each ball represents the amount of gas you inhaled. Yellow means 1,200 milliliters, red means 900 milliliters, and blue means 600 milliliters. You can measure and record the maximum inhalation force. 4Release Stress And Anxiety: When you breathe deeply, it also clears your mind and gets rid of the stress and anxiety that comes with daily work and activities. You can easily get through the day in a positive way. 5Perfect After Surgery Tool: If you have surgery and your breathing is not smooth, it can help you maintain and restore normal breathing. Its compact size makes it easy to carry around in a bag. You can also use it at home. Package included: 1 x Respiratory Trainer