This is an overdrive pedal that achieves an amp-like drive sound. With three knobs for Drive, Tone, and Level, it's easy to set up. Its characteristic of boosting the mid-range while cutting the low-end prevents your guitar's sound from getting lost in the mix. https://en.wikipedia.org/wiki/Ibanez_Tube_Screamer#:~:text=The%20Ibanez%20Tube%20Screamer%20is,2. It's a staple used in a wide range of genres such as blues, rock, and fusion, and there are many clones and modified models. https://en.wikipedia.org/wiki/Ibanez_Tube_Screamer#:~:text=The%20Ibanez%20Tube%20Screamer%20is,2. I was using this until recently, and I've checked its basic operation. Knowledge is required for use and installation. No claims and no returns. Please see the photos for the product's condition. This is a used item, so please refrain from bidding if you are extremely sensitive or looking for a condition like new. We will ship within 2-4 days after the bid. Management number: 46