BOSS "TR-2" Tremolo. What do you think? Operation confirmed. Instant purchase OK. ⚫︎ Includes the main unit and instruction manual (see photo 2). ⚫︎ The plastic part of the battery cover screw receiver is damaged, but the screw can be fastened normally (see photo 8). - Knobs: RATE, WAVE, DEPTH - Output terminals: OUTPUT, INPUT - Power: 9V battery or AC adapter This is a used item, so please understand that no returns or refunds are accepted. #Effecter