Check the listing for details. Lung Expansion&Mucus Relief Helper Breathing Exercise Device For Lungs. Color: White, Condition: New with box. Listed at 14.99 USD. Lung Expansion&Mucus Relief Helper Breathing Exercise Device For Lungs. Natural Lung Exerciser and Recovery Device: 15/16/18mm balls are suitable for most people to exhale exercise and improve breathing. Lung Expansion: As you exhale through the device, the steel ball creates resistance to airflow, which exercises the exhalation muscles and strengthens the lungs. Assisted Mucus Removal: The exerciser generates air pressure vibrations that loosen airway mucus, and you can remove the loosened mucus by coughing. 3 Different Sizes of Balls: Larger balls have greater exhalation resistance and better workout results. When the exhalation exercise becomes easier, you can change to a larger ball. Small and Portable: This breathing exerciser allows you to exercise your lungs anytime and anywhere without complex steps and venues. It is very convenient and easy to use. Keep using will have a better exercise effect, it is recommended to use 1-2 times a day, once for 5-10 minutes. Step 1 Hold the device with your hand and place it in your mouth, please make sure the mouthpiece is parallel to the ground. Step 2 Inhale through your Nose. Step 3 Hold your Breath for 2 seconds. Step 4 Exhale through your mouth, and keep your cheeks tight. Adjust the tilt to maximize.