These are particularly useful for improving hearing of people affected with SNHL. It is an electronic device that receives sound through a microphone, sends it though an amplifier. The amplifier increases the strength of the signals and sends them to the ear, through a speaker attached to the system. Hearing aids may be used behind the ear, in the ear or in the ear canal or completely inside the ear canal. There are two types of electronic hearing aids available - analog and digital.
Analog aids are adjustable and are custom made to meet the needs of each user. It can be programmed for different listening environments. They are less expensive. Digital aids convert sound into numerical codes before amplifying them. Digital circuitry can be used in all types of hearing aids.