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There are two kinds of FM systems: personal and sound field.
A personal FM system is coupled directly to a hearing aid or cochlear implant, with sound transmitted directly to the individual.
Special speaker units are placed strategically throughout a classroom or open space (e.g.
auditorium, cafeteria, etc.) to direct amplified sound to the vicinity where needed.
Visual Alerting Devices There are devices available to help individuals alert to sound using visual support.
A personal FM system needs to be set for each person using it.