tc electronic "Choka" tremolo. What do you think? Operation confirmed. Immediate purchase is welcome. Used item, so no returns or refunds. ⚫︎ Includes the main unit, instruction manual, and box (see photo 2). ⚫︎ Velcro is attached to the back of the unit (see photo 5). - Knobs: Speed, Depth, LFO - Input/Output: Input, Output - Power: 9V battery or AC adapter