I purchased this used and used it a few times after installing it on a board, but I'm selling it because I'm changing boards. Currently, there is no scratchiness, and the effect works normally. I am a novice, so I don't know much about the technical aspects. I will reply to comments as best as I can. Please understand the above before purchasing. The EP Booster is a black guitar booster equipped with a true bypass switch. - Model Name: EP Booster - Type: Booster - Input/Output Terminals: 1/4 inch jack - Switch: True Bypass Switch - Color: Black Thank you for looking.