A hearing loss ranging between 41 and 55 decibels (dB).

A hearing loss ranging between 56 and 70 decibels (dB).

Referring to just one ear, as opposed to binaural—both ears.

Using one hearing aid instead of two.

The volume at which sounds are most comfortable for a hearing aid user.

Hearing aids that have the ability to store different listening programs for access by the user. Many digital hearing aids have 3 or 4 memories.