Wireless FM-systems
FM systems consists of a transmitter and a receiver.
The receiver is connected to the CI-processor. The same receiver can also be connected with most conventional hearing aids.
The transmitter picks up the sound (e.g. from the teacher's voice, from the television or the cell-phone) and sends it via radio waves, wireless, directly to the tiny receiver. This enhances the sound quality in difficult listening situations (like in noise or at a distance)