This is a fuzz pedal that can produce 5 different types of sounds. I've only used it at home, so I don't think there are any noticeable scratches or stains. I've confirmed that it works. There are no missing items, including the box. The following is product information. ■VOLTAGE CONTROL Adjusts the operating voltage of the circuit. Turning it all the way to the left results in approximately 3V operation, creating a lo-fi sound like a "dying battery." As you lower the Voltage knob, the sound becomes more withered with a focus on the high frequencies, and the volume also decreases simultaneously. Turning the knob all the way to the right results in approximately 18V operation, producing a more open sound with less compression and enhanced bass. ■MODE SWITCH Switches between 5 modes with a rotary switch. Each mode combines different equalization and clipping styles to create 5 different fuzz sounds. I. Silicon Soft Clipping A rounded, compressed, traditional Big Fuzz tone. II. Silicon Clipping + Bass Boost Emphasizes the low end, creating a cranky sound with a compressed feel. III. Germanium Soft Clipping A dynamic and cranky sound that mixes distortion and fuzz. IV. LED Clipping Diode A dark and dynamic tone with a slight cut in the high end. V. LED + Silicon Soft Clipping Diode + Hard Clipping Silicon Transistor The most aggressive mode, with a loud and ferocious tone featuring intense gain and compression. ・Power: 9VDC center negative (adapter only) 200mA minimum ・SIZE: 6.7cm(W) x 5.8(H) x 12.6(D)cm ・WEIGHT: 300g