The Denon BU4500 dual cd deck drawer unit is the perfect addition to the dnhd2500 digital dj system. Connect this dual cd deck drawer to the dnhd2500 and it turns the unit into a fully functioning dual cd deck, just like the very popular dnd4500. The Denon BU4500 can also be used as a replacement drawer for the dnd4500 in the very unlikely event of a malfunction.