Pioneer DEH-P6900UB CD/MP3/WMA/AAC Receiver CD/MP3/WMA/WAV/AAC Playback Digital SpeedRead II Mechanism for Faster File Access BMX (Bit Media eXpander) Digital Sound Processing Supertuner IIID with Digital Signal Processing with up to 24-Station (18FM/6AM) Presets USB 2.0 - USB iPod Direct Control (optional CD-IU50 required); USB control of flash memory; USB control of MP3 players (not all devices compatible)