New, Unused This is an amp-style overdrive that can reproduce the legendary amp sound in a single unit. You can enjoy it quite a bit with just one unit because you can switch between 4 modes of clipping diodes!! It can reproduce the tones that famous guitarists such as SRV, Eric Clapton, Robben Ford, John Mayer, Santana, and Cory Wong have loved. - Features Smooth and balanced low to medium gain overdrive Natural distortion close to the "sweet spot" of a tube amp Wide range from light crunch to drive with pleasant sustain - Controls Volume: Overall volume Gain: Distortion intensity Tone: Adjustment of high frequencies Voice: Adjusts the character of the sound before distortion 4-mode selector: Diode switching 4 Modes 1- BAT41 Schottky diode (original Zendrive specification) 2- Germanium + BAT41 mix 3- LED clipping 4- 1N4148 (silicon diode) It seems to be configured as follows. By combining Voice and Tone, you can create a wider range of sounds than a typical overdrive. You can freely create sounds from light overdrive to rich sounds that won't get buried in a solo. True Bypass specification Power: 9V center negative (2.1mm x 5.5mm) Size: Approx. 11.5 x 6.5 x 5 cm Weight: Approx. 320 g