Share this article Share this article ResearchAndMarkets.com's offering. The global hearing aid market exhibited moderate growth during 2015-2020. A hearing aid is a small battery-powered electronic device that is used to improve hearing and is worn in or behind the ear. It is used to amplify the sounds to listen, communicate and participate in the daily activities by individuals with low hearing abilities. A hearing aid consists of an amplifier, microphone and a speaker that magnifies sound vibrations entering the ear, perceive larger vibrations and convert them into neural signals that are ...