Native Instruments' Z2 mixer. This item is listed as junk because it is missing knobs, vertical faders, and a crossfader. It is recognized as an interface, so if you have TRAKTOR, you can connect it to a PC via USB and control the internal mixer in TRAKTOR, which will produce sound and allow you to control the faders. Rather than a physical controller mixer, it can be used as an interface where the audio from Traktor is output from the Z2's OUT when connected to a PC via USB. If you attach chroma caps to the knobs, you can control gain, EQ, filters, song selection, loading, and other operations from the Z2 itself. Includes a TRAKTOR PRO 3 license. You may be able to operate it as a mixer by installing an Innofader, etc. Please understand that this is being sold as a junk item. Accessories: Power adapter USB cable TRAKTOR PRO 3 software (with transfer license) TRAKTOR KONTROL Z2, a 2-channel DJ mixer with filter and FX functions. - Model Name: KONTROL Z2 - Brand: TRAKTOR - Number of Channels: 2 - Connection: USB connection - Functions: Filter, FX, Macro FX Thank you for viewing.