Leading 5000ml Capacity: Our device offers an impressive maximum capacity of 5000 milliliters (5 liters), providing a broad range for lung capacity measurement and supporting evaluation of lung health. Enhance Breathing Techniques: Use the device to practice slow, deep breathing exercises to help improve oxygen flow and support lung expansion. Flow Rate Indicator: The indicator helps guide your breathing rhythm. If the indicator rises too high, you are inhaling too quickly. If it remains too low, your inhalation is too slow. Aim to keep the indicator in the middle range for steady, controlled breathing. Track Your Progress: Monitor respiratory performance with consistent measurements. The wide capacity range supports accurate tracking to help you measure improvements over time. Flexible tube and mouthpiece allow for comfortable positioning during use. The device is easy to clean and features built-in storage for the tube and mouthpiece. Color: Transparent Material: Plastic Package Contents: 1 x Breathing Exercise Device Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.