A device that is worn to blocking the sound to continue touching the eardrum is made from materials that can change shape when I leave for a moment. It will expand only a wearer's ear hole.
A wearable device to block the noise to the membrane made of a material that can change its shape when released shortly. It will expand the size of the ear of the wearer.
A device that is worn to a sound barrier sound that will affect the whole drum made from the material can change shape when released for a while. It will grow as the size of the wearer, the ear