After purchase, I tested it at home and then stored it in its outer box in a dark place. This unit can use three types of effects: booster, distortion, and delay, with a single DC9V power supply. I purchased it for practical use on a board and for collection purposes, but I am reluctantly selling it due to a lack of funds. This is a used item. Also, the price includes the cost of fees and shipping. Please be aware of this before purchasing.