This controller allows DJs to cue, play, search and scratch digital files. And by using the database search system, users can find any track by artist, title or genre. Plug in any USB memory flash drive, and play it right away without having to reboot the unit. With two USB ports and expandable further when using a USB hub, a USB keyboard can also be used for easy and faster navigation. The unit is able to play audio CDs with any compatible USB CD-ROM or DVD-ROM drive. Play back user-created CD-R's or DVD-R's loaded with MP3 or WAV music files using a compatible USB CD-ROM or DVD-ROM drive.