Leading 5000ml Capacity: Our device offers an impressive maximum capacity of 5000 milliliters (5 liters), providing a much broader range for precise lung capacity measurement, allows for a more thorough evaluation of lung health. Enhance Breathing Techniques: Use the device to practice taking slow, deep breaths exercises, improve oxygen flow, exp the lungs. Flow Rate Indicator: Use the indicator to guide your breathing. If the indicator rises above the higher position, it means you're breathing in too fast. If the indicator stays below the lower position, it means you're breathing in too slow. Aim to keep the indicator in the middle position. This means your breath is steady controlled. Track Your Progress: Monitor your lung health journey effectively with our device precise measurements, extensive capacity range provides more accurate detailed , helping you set achieve your respiratory goals. Flexible tube mouthpiece allows to easily adjust for use in positions, easy to clean after use. The device built in storage space for tube mouthpiece. Colour:Transparent Material:Plastic Package Contents: 1 Breathing Exercise Device Only the above package content, other products are not included. Note: Light reflection 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.