Breathing Exerciser for Lungs, Deep Breathing Trainer Leading 5000ml Capacity: Our device offers an impressive maximum capacity of 5000ml (5L), providing a wider range for accurate lung volume measurements. Use this device to practice slow and deep breathing exercises to improve oxygen flow and expand your lungs. Flow indicator: Use the indicator to guide your breathing. If the light goes higher, it means you are breathing too fast. If the light stays below the lower position, you are breathing too slowly. Aim to keep the indicator light in the neutral position. This means your breathing is steady and controlled. Track your progress: Efficiently monitor your lung health journey with our device's precise measurements and wide volume range providing more accurate and detailed insights. The flexible tube and mouthpiece can be easily adjusted for use in a variety of positions and are easy to clean after use. The device has built-in storage space for the tube and mouthpiece. Colour:As Shown Material:Plastic Package Contents: 1set * spirometer breathing exerciser 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.