This is a listing for the main unit and box of the Xotic Voltage Doubler. Operation has been confirmed. However, there is Velcro on the back and some scratches (please check the photos). Please understand that this is a used item with a general feeling of use, and we ask for no returns or exchanges. The sound quality is typical of Xotic, and especially when using the Voltage Doubler to run it at 18v and adding the original sound with the Blend knob, the result is natural and well-balanced. The SP Compressor allows for a wide range of tonal adjustments. - Model Name: SP Compressor - Brand: Xotic USA - Controls: Volume, Blend, Hi, Mid, Lo - Included: Box, power adapter - Type: Compressor effect pedal Thank you for viewing.