"Different Inhalation Rates: 3 color-coded balls represent different inhalation rates, and 3 chambers represent different inhalation rates, from 600cc/sec to 1200cc/sec.Deep Breathing Training: The Breathing Exerciser is a system for breathing exercises through inhalation, which helps to achieve optimal lung capacity and restore interrupted breathing patterns.Lung Recovery: The breathing exercise measurement system helps to develop, improve and maintain respiratory health, train lung capacity and promote lung recovery.Postoperative Training: If you have just had surgery and have difficulty breathing, the Breathing Lung Device can help you maintain and restore normal breathing.Reasonable Structure: Transparent design for clear observation. Strong and anti-shattering material, not easy to shake. The bottom is detachable design for easy maintenance and cleaning."