The Pioneer DJ OPUS-QUAD is a professional all-in-one DJ system that supports 4-deck playback, multiple media sources, and Bluetooth connectivity. It has a Smart Rotary Selector for rapid track search and easy-to-use professional effects. With a zone output and the ability to play tracks directly from a laptop, it offers versatility and convenience. The OPUS-QUAD also features 2 mic inputs for crystal-clear sound.