I purchased this used and used it a few times at home and once in the studio. It didn't suit me, so it's been sitting at home. It works. Velcro is attached to the back. The Ampeg Scrambler is an overdrive pedal for bass, with controls for Drive, Blend, Treble, and Volume. - Brand: Ampeg - Model Name: Scrambler - Type: Bass Overdrive - Controls: Drive, Blend, Treble, Volume - Back: Velcro attached Thank you for looking.