Respirometer Exerciser – 3-Ball Incentive Spirometer for Lung Training Key Features: Durable & Compact: Made from high-quality, break-resistant plastic for long-lasting use. 3-Ball Inhalation System: Features a 3-ball incentive spirometer to measure inhalation strength and help track progress. Stable & Solid: Non-shaky construction ensures accurate readings during exercises. Easy to Clean: Removable bottom allows thorough cleaning and hygiene maintenance. Comprehensive Respiratory Training: 3 chambers with varying inhalation rates (600cc/sec to 1200cc/sec) for progressive lung capacity training. Supports restoring disrupted breathing patterns and achieving optimal lung function. User-Friendly: Comes with complete instructions; instructional video included in images. Note: Ball colors may vary.