Thank you for viewing. This is a nano-sized Q-tron for sale. It's an envelope filter/auto-wah that can be used with both guitar and bass, and is an easy-to-use effector, including its size. ■ About the product condition Operation has been confirmed. The main unit is in beautiful condition. Please understand this beforehand, and refrain from purchasing if you are sensitive to such things. Returns are not accepted due to the high price of the item. ■ Accessories Please see the 4th image. *Price negotiation is possible.