I have 2 NDX400 cd/mp3/usb players you can scratch and has other features on them 1 numark DM 1050 two channel mixer and a old numark Axis 9 and I also have 1 numark X6 mixer two channel mixer with special features and 2 carrying case Make me an offer I’m willing to bring the price down Features on the NDX 400. Control DJ software and play music from USB flash drives, CDs, or MP3 CDs Built-in USB computer audio interface for playing back music from your Mac or PC Touch-sensitive scratch and search wheel for unprecedented control Control DJ software via USB MIDI Auto BPM with tap override for instant tempo analysis Start/stop time adjustment for vinyl-style braking Three hot cues for quick access to key points Seamless looping with stutter start for easy loop creation and integration Pitch tracks up or down by up to 100% Master Tempo preserves key while pitch-shifting Anti-ShockTM buffered skip-protection technology Text display for quickly and easily navigating media files Pre-mapped for deep integration with Serato DJ* Class-compliant, instantly works with Windows and Mac OS X, no driver required