You are buying one new Z. Vex Effects Power Plate (A.C. jack adapter). It is brand new and comes with a full factory warranty. 

The following is the text from the Z. Vex website: 

"In response to overwhelming requests for modifications to Z.Vex pedals for use with A.C. power supplies, I am now making retrofit plates that you may use with any Z.Vex pedal that allow connection to a standard Boss-type (5.5mm X 2.1mm barrel-type) A.C. power supply."   Zachary Vex