Drive pedal for guitar. I've used it a few times live, but I used a switcher, so I rarely stepped on it directly, and there are no noticeable scratches or stains. Operation has been confirmed with both battery power and power supply. There was no crackling. Velcro is attached to the back. Please refrain from purchasing if you are nervous, as this is a used item. Please note that I will not reply to comments requesting a price reduction.