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.<br> Enhance Breathing Techniques: Use the device to practice taking slow, deep breaths exercises, improve oxygen flow, and expand the lungs.<br> Flow Rate Indicator: Use the indicator to guide your breathing.<br> If the indicator rises above the higher position, it means you're breathing in too fast.<br> If the indicator stays the lower position, it means you're breathing in too slow.<br> Aim to keep the indicator in the middle position.<br> This means your breath is steady and controlled.<br> Track Your Progress: Monitor your lung health journey effectively with our device precise measurements, extensive capacity range provides more accurate and detailed , helping you set and achieve your respiratory goals.<br> Flexible tube and mouthpiece allows to easily adjust for use in positions, easy to clean after use.<br> The device built in storage space for tube and mouthpiece.<br> Colour:Transparent Material:Plastic Package Contents: 1 * Breathing Exercise Device Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.<br> The measurement allowed error is +/- 1-3cm.