A hearing aid is a device that people who have hearing problems use to hear more easily. Early designs of the hearing aid can be described as "ear horns," funnel shaped amplification devices that people put up to their ears whenever they needed to listen to something.
Of course, the evolution of technology made it possible for the extinction of the atrocious-looking device. Now, hearing aids are commonly electronic devices that are worn on the ear like the conventional ear phone. The first design of these had a rectangular battery pack that connected to the ear piece with a lengthy wire. The battery pack was usually placed in the user's pocket. This design tended to be flawed, as the microphone used to amplify sounds wasn't placed very strategically, often suffering disturbances from the user's clothing. During the mid 20th century, they came up with hearing aids that had a small battery inside the actual earpiece.
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