This is a 28 year old intercom system. It was removed a year ago. The components consist of the master unit, 5 room speakers, and 2 doorbell components. When it was removed, all of the parts worked, but the master unit was "touchy", the 5 room speakers had some noise, some of the room speakers are faded, and 1 doorbell unit is unused. I assume that it may be useful for parts. Please, email if you have any questions.