Dot OEL Display with 12-Character Text (Lower Case Characters Displayable) 7-Way Rotary Commander Anti-Dust Design SD/SDHC Memory Card Slot USB Direct Control for iPod/iPhone (CD-IU50 Required) Front USB Port iTunes AAC/MP3/WMA/WAV Playback Advanced Sound Retreiver Hi-Volt Preouts x 3 (4 v) Display Off Mode MOSFET 50 W x 4 Built-In High Power