The terms personal guidance system (PFA), whispering system, tour guide system, plant guidance system or Pefa refer to devices or communication systems that function practically identically in principle: A speaker is connected to a group of people by means of a microphone, radio waves and headphones. The aim is to ensure interference-free and distraction-free communication. Guidance systems and the like are used, for example, whenever the services of simultaneous interpreters, whispered interpreters or "translators” are called upon at congresses, court proceedings or conferences. An at least equally important field of application for Starnberg are city tours, company visits and guided tours through exhibitions and museums. In other words, wherever a speaker must be given the full attention of a group of listeners. In this context, guide systems are also used when accessibility is important: for example, when communication within a group with people with impaired hearing is to be trouble-free. The guide systems are then extended with additional so-called "induction loops” to control hearing aids and hearing aids.