This is the ZOOM A2.1u multi-effects processor for acoustic guitars. It features a variety of effects including amp simulators, reverb, chorus, and compression. It also has a USB connection for recording. The included pedal expands the range of performance expression. Appearance: There are noticeable scratches and dirt on both sides (please see the photos). It has been stored unused for about the last 10 years. Operational Check: Operation has been confirmed with both four AA batteries and a power adapter. Included Items: Main unit only (power adapter etc. are not included). Please refer to the manufacturer's website for manuals. Please purchase only if you understand that this is a used item and accept its condition.