Operation confirmed. Please refer to the photos for any stains or condition issues. Please understand that this is a used item managed by an amateur. Please refrain from purchasing if you are sensitive to such things. Also, I plan to do minimal, simple packaging. I can change this for an additional fee, so please comment. Although this is a guitar effects pedal, it is also used by bassists such as Kentaro Nakao (NUMBER GIRL, ART-SCHOOL), Hidekazu Hinata (STRAIGHTENER, NCIS), and Sohei Mishima (cinema staff). I also tested it with a bass, and I was able to easily create a variety of sounds, from light distortion to heavy distortion. I plan to list other musical instruments and equipment, so please take a look. Model Name: Palisades - Brand: EarthQuaker Devices EQD - Power: 9V 2.1mm center negative Overdrive Distortion Fuzz