Panasonic sc pm 20 is an audio system that allows you to listen to radio broadcasts, play music from CDs, and use an external unit. This system can play normal CDs, as well as CD-R and CD-RW discs. It features a variety of functions, including the ability to change the sound quality, adjust the tone quality, and use a "live" effect. You can also use the system to record radio broadcasts and CDs onto cassette tapes. The system also has a number of timer functions, including the ability to set a play timer, record timer, play/record timer, and sleep timer.