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Hearing Aids Market Revenue | Global Analysis Report 2031 Hearing aids are devices used to amplify sound waves, with additional advantage of cancelling noise. Hence, these help a person with hearing impairment to improve his or her hearing ability. These are available in different sizes and shapes. The basic hearing aids are behind the ear (BTE), receiver in the ear (RITE), in the ear (ITE), and canal hearing aids (ITC), (CIC), and (IIC). Hearing aids are powered by either analog or digital platform.