This is a set including the ZOOM multi-effects processor MS-50G+ (MultiStomp), a compatible AC adapter also from ZOOM, and an underplate specifically for the aforementioned effects processor. Both the effects processor and the compatible adapter have been tested and confirmed to be working. However, as these are used items, there is some wear and tear. Please refrain from purchasing if you are overly concerned about the condition. The underplate is magnetic and attaches to the bottom as shown in the 12th photo. There is some residue from Velcro tape. Immediate purchase is welcome. No individual sales, and no holds. Thank you. Manufacturer...ZOOM