The Marshall GUV'NOR PLUS GV-2 is a guitar effects pedal with four control knobs, offering a distinctive overdrive sound. I haven't used it in about a year or more, so the operation is unconfirmed. - Model: GUV'NOR PLUS GV-2 - Brand: Marshall - Number of control knobs: 6 - Power connection: DC jack - Appearance condition: Shows signs of use, has scratches Thank you for looking.