This is a set of the BOSE Wave music system Model AWRCCB and the Multi-CD Changer Accessory. The Multi-CD Changer is a repaired unit, as it had a malfunction where CDs could not be ejected. It is believed that two CDs were inserted into one slot, causing the gears that move the CD unit up and down to break, resulting in the malfunction. The teeth from other gears were transplanted and glued to repair it, allowing for smooth rotation. The orange light illuminates when a CD is in the slot, and the green light illuminates during playback. Pressing the CD button on the remote control cycles through d1 (main unit), d2, d3, and d4. When a CD is in a slot, the CD in the next slot will play after the current CD finishes. Both the main unit and the changer can read and play CDs normally. Please refer to the photos. FM radio can be received using the power cable, which also functions as an antenna. This is an old, used product, so please consider purchasing it with no claims and no returns.