When hearing loss is confirmed, several solutions are available to regain the pleasure of hearing. One of the first is hearing amplification devices. But how do hearing aids work? While many models and technologies are available on the market, few people know the ins and outs. However, basic notions in this area can help to see more clearly and, possibly, to hear better. In addition to the types of technology and the different models (earloop, in-ear, etc.), each device is composed of 4 key elements: A microphone; A speaker (or earphone); A battery; An amplification system (the computer). The latter …