Protects the ear
From rapid and strong changes in air pressure, such as those that occur in an airplane.
Inserted in good time before landing (or a descent on a mountain railway), it forms a small chamber in the ear canal in front of the eardrum.
A high-precision filter ensures that the increase in air pressure in this chamber is delayed.
This prevents painful bulging of the eardrum.
For children up to approx. 12 years of age.