The RM-CDU is a CD, USB, & SD card player with built in Radio Data System (RDS) Tuner all in one rack space. It has FM/AM memory presets, Random, Repeat, Folder advance, Mute, and Program function. The RM-CDU will accept up to a 16GB USB, SD card/SDHC, and will play media from CD, CD-R, CD-RW, or MP3 disk, in either MPS or WMA format. The RM-CDU features easy to locate and read function buttons on the front panel. These buttons can be illuminated by pushing the LED button on the front panel. This makes for easy controlling in a dark room or when in a rack. The RM-CDU includes a remote control.