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Ear Machine Hearing for Old Age/Ear Hearing Machine Aid Machine/Cyber Sonic Hearing Aid. A hearing aid is a device designed to improve hearing by making sound audible to a person with hearing loss. Hearing aids are classified as devices in most countries and regulated by the respective regulations. Small audio amplifiers such as or other plain sound reinforcing systems cannot be sold as "hearing aids". Modern hearing aids require configuration to match the hearing loss, physical features, and lifestyle of the wearer. This process is called "fitting" and is performed by audiologists. The amount of benefit a hearing aid delivers depends in large part on the quality of its fitting. Almost all hearing aids in use in the US are digital hearing aids.