I'm selling this because I haven't used it much. It's in excellent condition with no noticeable stains or scratches. Used only in a home studio. NEUTRINO V2, an envelope filter that achieves a wide variety of sounds. - Model Name: NEUTRINO V2 - Type: Envelope Filter - Control Knobs: GAIN, PEAK, RANGE - Made in: USA Non-smoking environment. Kept in a pet-free environment. Please refrain from purchasing if you are sensitive to used items. To keep the price as low as possible, the item will be shipped with simple packaging. Thank you for your understanding.