Behind the ear
Behind-the-ear hearing aids hook over the top of your ear and rest behind the ear. The hearing aid picks up sound, amplifies it and carries the amplified sound to an ear mold that fits inside your ear canal. This type of aid is appropriate for almost all types of hearing loss and for people of all ages.
A behind-the-ear hearing aid:
Is the largest, most visible type of hearing aid, though some new versions are smaller, streamlined and barely visible Is capable of more amplification than are other hearing aid styles
These are usually very small behind-the-ear-style devices, although larger behind-the-ear devices can be modified for a more "open" fit. Sound travels from the instrument through a small tube or wire to a tiny dome or speaker in the ear canal. These aids leave the ear canal open, so they're best for mild to moderate high-frequency losses where low-frequency hearing is still normal or near normal.
An open-fit hearing aid: Is less visible Doesn't plug the ear like the small in-the-canal hearing aids do May use very small batteries Often lacks manual adjustments due to the small size