Numark Mixdeck Quad | 4-Channel Universal DJ System for CD, MP3, USB, software, and iPad Complete system with CD/MP3/USB decks, mixer, computer audio and MIDI interface, and iPad core MIDI and audio support MIDI integration of decks and the mixer for controlling both computer software and iPad apps Crossplay Technology: mix USB flash drive content from either port on either deck Four-channel mixer with EQ/rotary kills, replaceable crossfader, and MIDI control Two large, backlit displays for BPM, CD/MP3 text tags, and folder navigation