Invisible In-The-Canal (IIC)
An invisible in the canal aid (IIC) is a completely invisible hearing aid.
A completely in the canal (CIC) is the smallest and least visible type of hearing aid that fits deep into the ear canal.
An in the canal hearing aid (ITC) is less visible than any of the other larger styles of hearing aids.
Full Shell or In-the-Ear (ITE)
A full shell hearing aid or a in the ear (ITE) hearing aid is the larger of the hearing aid styles which allow for many features, including volume control, larger battery size, and a larger receiver which will allow for the fitting of severe hearing impairments.