Denon DJ DN-X1600 Professional 4-Channel Matrix Mixer with USB Audio I/F (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty Fully MIDI Mappable with additional focused area of up to 4 MIDI pages by parameter knobs and buttons Traktor Scratch Certified Mixer Independent Effector w/14 Effects available MAC,Windows XP/Vista/Win7,8 Compatible