1)Translate sound to digital code, change it and re-transmit it back by using mathematical calculations.

2)Duplicates sound transmission.

3)Produces a high quality sound that is extremely accurate.

Many believe that the digital system has revolutionized hearing by accurately duplicating sound transmission. Digital hearing aids have many benefits and lots of automatic features, although some still believe that programmable analogue aids possess great sound quality and functionality and are great in that they are more affordable.

Hearing aids have certainly come a long way since those first wooden devices from the 1500's. If you look at the history of hearing aids, you will find an amazing evolution of technology. In the 21st century, it seems almost everything has gone digital, and hearing aids are no exception.With at least 22 leading manufacturers of digital hearing aids, it is safe to say there has been a massive increase of demand for high-quality products. Many companies are in the process of developing even better digital technology; some are working on fourth and fifth generation digital hearing aids.
Ear Ringing

my gradma uses a hearing aid. it is a good product.