Feature:1. DIFFERENT INHALATION RATES: 3 color coded balls for differing inhalation rates, and the 3 chambers with different inhalation rates from 600cc/sec to 1200cc/sec.2. LUNG RECOVERY: Breath exercise measurement system helps to develop, improve and maintain respiratory fitness, training lung capacity, and promore lung recovery.3. DEEP BREATHING TRAINING: Breathing exerciser is a system to exercise respiration through inpiration, helps achieve optimal lung capacity and restore interrupted breathing patterns.4. REASONABLE STRUCTURE: Transparent design for clear observation. Sturdy and anti breaking material, not easy to shake. Detachable design at the bottom, easy to maintain and clean.5. POSTOPERATIVE TRAINING: If you have had surgery and are not breathing well, the breathing lung exerciser can help you maintain and restore normal breathing.Specification:Item Type: Deep Breathing Lung ExerciserMaterial: ABS.Package List:1 x Deep Breathing Exerciser1 x Mouth Blow Head