The BLACKSTAR HT-DUAL (DS-2) is a legendary tube pedal, a "classic" in the tube pedal world. In a nutshell, it's a "real drive pedal that's like having a tube amp circuit packed into a pedal." It stands apart from recent digital simulators and light distortion pedals, with its overwhelming thickness and sound pressure being its charm. 1. Equipped with a genuine vacuum tube (ECC83/12AX7) A real vacuum tube is built into the pedal and driven by a high voltage of 300V. This provides a response to picking dynamics and rich, sticky overtones, just like a tube amp. 2. Versatile 2-channel design You can switch between two modes with a footswitch. CH 1 (Clean/Crunch): From clear clean to gritty crunch. You can further change the character with the mode switch. CH 2 (High Gain): A modern high-gain sound that doesn't lose its core even when heavily distorted. 3. Blackstar's unique "ISF control" This might be its most distinctive feature. Turn it all the way to the left (USA): A tight, well-defined American sound (Mesa/Boogie style). Turn it all the way to the right (UK): A mid-range rich, warm British sound (Marshall style). With this single knob, you can infinitely adjust the character of the amp. It works without any problems, and even with a small amp, you can immediately enjoy the power of a large amp. Of course, even with a large amp, the sound pressure is overwhelming! If you like distortion, please try the distortion of a vacuum tube! There are no major scratches, but there are some scratches from use. Comes with an adapter. Thank you.