Breathing Device, Flutter Valve, Breathing Exercise Device for Lungs Adjustable Resistance for Effective Mucus Clearance Efficient Mucus Clearance: Utilizing a unique vibrating airflow mechanism, this Breathing Device effectively loosens and expels mucus, enhancing lung function and breathing comfort. Its innovative design is perfect for those seeking to maintain healthy airways. Adjustable Resistance for Customized Training: Tailor your respiratory workouts with the adjustable resistance feature of this Breathing Exercise Device. Suitable for both therapeutic needs and athletic training, it strengthens lung capacity and endurance. Versatile and Supportive for All Users: From athletes to patients in recovery, this device supports users at any level of respiratory fitness. It promotes more efficient breathing and overall lung health, making it an essential tool for respiratory wellness. Color: As Shown Material: PVC Package Contents: 1 x Breathing Exercise Device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.