Mr. Black Delay Dark Echo Operates with both an adapter and batteries. Functionality is not an issue. Produces a rather dark and mysterious echo sound. The casing shows scratches and signs of use. The images have been corrected to appear cleaner. The SWAY knobs have damage. The part between the left shield indicator is missing. There is no looseness. I'm not sure of the market price, but I have some knowledge of guitars, so please let me know your desired price in a reasonable range.