### device | electronic device:

Hearing aid
* All hearing aids have batteries
  - receive their power from a battery
  - stimulate tiny bones in the middle ear
* Many hearing aids have the ability to be modified for direct auditory input.
* Most hearing aids have an adjustable volume control and are powered by small, replaceable batteries
  - make everything louder
* Some hearing aids are simple instruments which do a straight forward job of amplification
  - can function as receivers
* Some hearing aids have larger volume control wheels to make handling easier
  - more than one group of settings
  - volume controls and other controls, which can be used for adjustments
* amplify all sound, so sometimes they are very loud
  - sound so that it's loud enough to be perceived
  - sound, making the sounds louder
* are a critical first step in treating hearing loss
  - able to amplify sound and in some cases they block background noise
  - also an option in relieving the perceived hearing loss in otosclerosis
  - an unreliable indication of how much a person is able to hear
  - assistive devices which improve hearing for some individuals
  - beneficial in the treatment of sensorineural hearing loss
* are electronic instruments custom-fitted to a person's ear for sound amplification
  - or battery-operated devices that can amplify and change sound
  - embarrassing and make people look older
  - like cochlear implants in that regard, i.e., hearing prostheses
  - microphones placed at the listener's ear
  - more prone to experience interference in weak reception areas
  - now of therapeutic value in cases of auditory nerve damage
* are often a necessity during adulthood
  - good remedies to individuals with minimal hearing loss
  - one of the mainstays of personal communication for people with hearing loss
* are the answer for some, assistive listening devices for others
  - most common form of help for a person affected by sensorineural hearing loss
  - third most widely used assistive devices following eye glasses and canes
  - unquestionably an effective way of reducing the handicap of hearing loss
  - useless to people with sensorineural hearing loss
  - usually the best solution to a sensorineural hearing loss
* are, without a doubt, the biggest commercial application of auditory principles.
* can aid in both sensorineural hearing loss and tinnitus
  - also function as maskers by amplifying external sounds
  - be difficult to fit, often requiring several adjustments
  - benefit many children with sensorineural loss
  - compensate for some kinds of hearing loss
  - increase the volume of speech the child is hearing
  - make soft sounds louder and can make listening easier
  - often reduce the effects of hearing loss
  - rectify a permanent hearing loss
  - selectively amplify sounds in each frequency range with hearing loss
  - trap moisture in the ear canal
  - usually help hearing loss that involves damage to the inner ear
* come in a wide range of sizes or styles
  - many types, designs, and styles
  - with a long string attached in case they go in too far
* continue to get stronger and smaller.
* draw more current from batteries than wristwatches do.
* enable a person with a hearing loss to hear normally.
* enhance the ability to hear for most individuals who exhibit difficulty hearing.
* fill the gap created by a hearing loss by receiving and amplifying sound.
* help many people with hearing loss.
* improve the quality of life.
  - flesh coloreds
* is located in drawers
  - ears
  - made of plastic
* make sounds louder and deliver the amplified sounds to the ear.
* play a major role in improving hearing sensitivity for individuals with presbycusis.
* provide amplification of sound that is very helpful.
* remain the usual treatment of patients with sensorineural hearing loss.
* require maintenance to function properly.
* require special batteries
  - care
* tend to over-amplify background noise.
* vary widely in their styles, sizes, and levels of circuit thecnology.
* work basically the same as any amplifier - they simply make the sounds louder.