There are marks from Velcro that was attached to the back. Power-on tested. The MXR '78 Distortion is an effects pedal that provides a rich distortion sound. - Brand: MXR - Model Name: '78 Distortion - Function: Distortion pedal - Controls: OUTPUT, TONE, DISTORTION, INPUT, CRUNCH - Accessories: Instruction manual - Condition: Includes the main unit, box, and instruction manual Thank you for viewing.