This is a signature model of the Diablo by OKKO, a German effects pedal brand. It's a 2-in-1 pedal that combines the Diablo, a renowned overdrive, with a booster. You can create great sounds with any setting, from low gain to high gain. I bought it new and loved using it, but I'm selling it because I haven't been using it much lately. There are fine scratches overall, and it shows signs of use. The footswitch contact is poor, and the effect sometimes doesn't work as usual, so I'm selling it at a lower price than the market value. I've attached a link where you can hear sound samples. https://youtu.be/y-HFPl-2fkA?si=AUHt5Q486Uoga3CA Here's the manufacturer's description: The Diablo GH is a 2-in-1 pedal featuring overdrive and boost. With its exceptionally wide dynamics and clear, warm tone, it's a masterpiece by Heiko, worthy of being called the Super Diablo. We thoroughly researched its compatibility with clean amps, making it easier to combine with your amplifier.