high quality Incentive Spirometer AdultIt is a single patient multi-use device used in hospital or home care setting.The incentive spirometer is an over-the-counter deep breathing exerciser .Applicable people: It helps improve lung capacity, increase respiratory strength and facilitate deep breathing for adults and pediatrics above 5 yearsLeading 5000ml Capacity: Our device offers an impressive maximum capacity of 5000 milliliters (5 liters), providing a much broader range for precise lung capacity measurementUpgraded Durable PC MaterialConstructed with high-quality PC material, this breathing exercise device for lungs is incredibly durable and shatterproof. Unlike other models made from fragile materials, this device withstands heavy use without breaking.Airflow Indicator for Controlled BreathingFlow Rate Indicator& Precise Control: Our distinct flow rate ball can guide your breathing. If the yellow ball rises above the upper limit, you are inhaling too quickly; if it stays below the lower limit, you are inhaling too slowly. Aim to keep the indicator at the smile face in middle positio for optimal breathe level.Easy to useWe have instructions for use It is not difficult to use, The flexible tube and mouthpiece design allow for easy adjustment in various positions. After use, they are easy to clean, and the device includes built-in storage space for convenient organization. The removable tube and mouthpiece also easy clean after use and good for hygienic maintenance.