Styles of hearing aids include:
Invisible-in-the-canal (IIC) & Completely-in-the-canal (CIC) hearing aids: these are the smallest and most cosmetically discreet. The instruments fit completely in the canal and are custom-made. There is a clear nylon string to help with insertion and removal. They are powered with a #10 hearing aid battery.
In-the-Canal style hearing aids (ITC): these are larger than the CIC devices. They fit within the ear canal and are custom-made. They are powered with a #312 or #10 hearing aid battery.
In-the-Ear style hearing aids (ITE): these are larger than the ITC style. They fit in the ear, filling the entire "bowl" of the ear. They are custom made. The customization along with the lightweight and compact size makes these instruments comfortable and easy to manage. They are powered by a #13 or #312 battery.
Conventional Behind-the-Ear style hearing aids (BTE): the processing components are housed in a case that fits behind the ear. Sounds enter the instrument, are amplified, and travel through a tube that is contoured over the top of the listener's ear and into an earmold inside the ear. BTEs are durable, easy to handle and maintain, and can be easily adapted for use with the wide variety of assistive listening devices. They are powered with a #675 or #13 battery.
Open-Fit and Receiver In the Canal Behind the Ear Style: These are similar to the conventional BTE but are much smaller, making them more discreet. A very small tube leads to the ear canal making this option much more cosmetically appealing while offering superior sound quality.
Typical costs of hearing aids:
Premier Digital Technology Hearing Aids: $2200 to $3200 each
Advanced Digital Technology Hearing Aids: $1400 to $2500 each
Standard Digital and Analog Technology Hearing Aids: $700 to $1700 each