Behringer AB100 Instrument / Amp Selector Purchased urgently for a performance and used once, but has been stored since then. There are no included accessories such as the box or instruction manual. Upon re-testing the unit this time, it worked normally with an external power supply (adapter, etc.), but did not work with batteries. I had never used batteries before, so I only noticed this during this check. Please consider this when purchasing. When using an external power supply, both the switch and level knobs work without any problems, and the overall condition is good. A part of the rubber on the back is peeling off, but I have chosen not to glue it and am selling it as is. It has been used infrequently and is in good storage condition. However, please understand that this is a used item, and those who are concerned about minor details should refrain from purchasing.