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.