The insert is part of sealing the ear canal before flowing sounds from the outside, that may interfere with the emission of sound from the hearing aid user's ear canal. When using a hearing aid insert, for a limited time, it is placed in the duct ear. It is used in a natural body orifice and placed in it without the need for surgery.

- facilitates rapid testing of hearing aids
- used as a replacement for the individual inserts
- used for testing hearing

Available sizes: from 1 to 6