Secure Digital media slot lets you enjoy MP3s and WMAs saved on Secure Digital media cards (media not included); encode CDDA to MP3 format to SD card * 30 FM station preset memory so you can store your favorite stations for instant recall * 5-key line remote control for easy access to CD function controls * Requires 2 AA batteries (not included) Bass boost system brings out the bottom end of the sonic spectrum * Hold function prevents you from inadvertently changing a song