Sirus Ready CD Receiver with MP3/WMA & AAC Playback RMS (Continuous) Power: CD receiver with built-in amplifier (22 watts RMS/50 peak x 4 channels) Auto-slide motorized, detachable face with multicolor dot-matrix display Advanced Codec (AC) Drive with Voice Index on Tap offers voice confirmation of digital music folders and files MP3 Playback: Plays CDs, CD-Rs, and CD-RWs (including discs loaded with