Kenwood Excelon KDC-X591 CD receiver with MP3/WMA/AAC playback CD player with built-in MOSFET amplifier (22 watts RMS/50 peak x 4 channels) plays CDs, CD-Rs, and CD-RW discs including discs loaded with MP3, WMA, and AAC files (will not play Digital Rights-protected music files on disc) optional connecting cable gives you iPod control uses both the USB and aux inputs