This is a Native Instruments MASCHINE mk3. I purchased it new and have always kept it in a soundproof room, so it's been in an environment with low humidity and little dust, and there's almost no dirt. The guide book is also included in the sale. An AC adapter and USB cable are included, and I will pack and ship it in the original box. I will apply for the transfer ID after payment is complete and will provide the ID via message. I've used it for just over a year, but I'm selling it because I've been mainly composing without using the sequencer.