Inductance coil is used in many areas of the case is very common, and hearing aids is one of them, when in this area, many people will be a little doubt, what role does this inductance coil, the answer will be made to answer you, use this is to allow the signal to keep a certain hearing, inductance coil has sensing function, so that the hearing aid receiving external signals to respond. We found it in many places, because of its small size, often is not easy to see it mami. Even though it is not to be ignored.