A hearing aid is an electronic device usually worn in or behind the ear to amplify sound. More than 1,000 different models are available in the United States. All of them include a microphone (to pick up sound), amplifier (to boost sound strength), a receiver or speaker (to deliver sound to the ear), and are powered by a battery. Depending on the style, it's possible to add features to filter or block out background noise, minimize feedback or lower sound in noisy settings. Hearing aids are either "monoaural" (a hearing aid for one ear), or "binaural" (for two ears); more than 65% of all users have binaural aids. A hearing aid enhances sound so you can hear better. Since hearing loss is gradual, it's common to become unaccustomed to environmental sounds such as traffic noise or background conversation. Because of this, when a person begins wearing a hearing aid, it is necessary to re-educate the brain to practice selective listening, the ability to choose only those sounds which you wish to hear.
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