Distortion pedal transistor or integrated circuit, no lights.
9v battery or power supply.
volume, drive and tone.
jack "in" cross of power supply is, as usual!
some older models have a longer look "old" a little chrome, a little "lada"!
nice.

UTILIZATION

Like any guitar pedal!

SOUND QUALITY

There is particular!

If you are looking for distortion or even a killer overdrive couillu, go your way.
saturation is a slight ... light ...

I had bought one before, I quickly exchanged against something else!
So disappointing! ... but ...

but this pedal has a great success now, especially in jazz and blues, as it simulates a surprisingly small natural saturation of the lamps that have pushed a little.
suddenly, with a humbucker in it, it's nice.
So it is a vintage looking.
Therefore, the note? ...
zero for some and 10 for others!
go ... 10! ...

OVERALL OPINION

Okay, if you know what you want ... because it makes a sound, period ... and not a killer trick!
but it became a legend that some even try to emulate ...
then ...