YAMAHA effector with distortion and modulation functions. - Brand: YAMAHA - Model Name: DM-100 - Type: Distortion/Modulation - Output Terminals: OUT 1, OUT 2 - Adjustment Knobs: DISTORTION, OUT LEVEL, HI, LO - AC Adapter: Usable - Country of Manufacture: Japan Since there is no adapter or batteries, the operation has not been confirmed. This is a used item, and as the photos show, it has many scratches. Please understand this before purchasing.