Custom hearing aid that fits in the ear canal. Smaller portion shows in outer ear.

In-The-Canal (ITC)

Pros
Custom-fit to your ear.
Less visible than larger custom styles.
Can include controls for volume and memory that won’t fit on smaller custom hearing aids.
To consider
Second largest custom style.
Small size may be challenging to wearers with dexterity issues.
Small batteries require more frequent changing — rechargeable is available in select styles.

These hearing aids are (IIC) Invisible In Canal