CIC
The CIC (Completely-in-the-Canal) style is the smallest solution, hidden in the ear canal. It is discreet and often called invisible. It is miniaturised as far as the anatomy of your ear allows and sits very deep in the ear. It is usually intended for people with mild to moderate hearing loss. Because of its small size it has no manual controls, such as volume wheels or programme buttons, and cannot be connected to a mobile phone.