Thank you very much for viewing. This is a KORG ZERO4 DJ mixer/audio interface. It has been stored by an individual. There are no noticeable scratches, but there are some minor scuffs, so please check the details in the photos before considering a purchase. Also, the power has been confirmed to be on. Thank you. [※Operation of LINE-IN → MASTER-OUT and all knobs and faders were generally problem-free] ＜Product Description＞ This is a "core station" that integrates a digital mixer, audio I/O, MIDI controller, and effector into one unit. Within a single unit, you can set the switching between records, CDs, microphones, FireWire audio, MIDI controllers, and MIDI controllers + audio for each channel. By connecting turntables, CD players, laptops + software, and digital/analog instruments, you can achieve advanced live mixing such as impromptu mixing, MIDI control, and effect control with a simple setup via FireWire connection. It is truly the most powerful and flexible tool developed for live performance. Thank you.