I was using this on my effects board, but I'm selling it because I'm changing my equipment. This is a classic BOSS pedal, the SD-1, with a feedback function that activates when you step on the pedal. As it's a vintage effects pedal, there is some wear and tear, and signs of aging. Because it was on a board, there's Velcro on the back. I checked the operation before listing it, and it works normally. This is an early model, before it was renamed SUPER Feedbacker & Distortion due to a trademark issue with DiMarzio's popular Super Distortion pickup, so it's quite rare. It's currently discontinued, so if you're looking for one, or if you're a collector, don't miss this opportunity. - Model Name: DF-2 - Brand: BOSS - Condition: Used, with scratches Compatible with ACA adapter http://lib.roland.co.jp/support/jp/manuals/res/1808963/DF-2_j.pdf?_gl=1*1vy9y3n*_gcl_au*MTQzMTk4NDYuMTc2MDI0MzU3NA..*_ga*MTM4ODQ5MjEyNS4xNzYwMjQzNTc0*_ga_CF0D38ZPLC*czE3NjAyNDM1NzUkbzEkZzAkdDE3NjAyNDM1NzUkajYwJGwwJGgw&_ga=2.221040536.146030077.1760243574-1388492125.1760243574