The Crescendo 50 system is a portable, battery operated listener which is light & comfortable to use. The sound from your TV or radio is picked up by a microphone, is amplified & heard through the either a Stethoscope Headset or through a Neckloop when using in conjunction with a Hearing Aid. The system is used for listening to the TV, radio or for conversation. It will amplify the sound to the user whilst maintaining the TV or radio at a volume level that will not disturb family, friends or neighbours.