Hearing Aids can be classified into 3 groups:
Daily Wear In-The-Ear
Daily Wear Behind-The-Ear
Extended Wear
Daily Wear ITE
In-The-Ear styles
Daily Wear BTE
Behind-The-Ear styles
Extended Wear Lyric
Invisible Lyric Hearing
In-The-Ear styles
Behind-The-Ear styles
Invisible Lyric Hearing