A hearing aid is provided comprising a microphone, an amplifier, an earphone, and at least one data storage. A large number of detailed hearing aid features are identifiable in an easy way. The data storage forms a component part of an identification means and stores at least one hearing aid feature...http://www.google.fr/patents/US5210803?utm_source=gb-gplus-shareBrevet US5210803 - Hearing aid having a data storage
