Analog distortion pedal ... everything has been said
Note the presence of indicator (the "RAT", features on the knob) phosporescents very convenient to locate in the dark (on stage what ^ ^)
you doing a 9V battery in there and it sounds nikel
I put 9 because they would have just had a little round the edges you have to switch to slow down but nothing dramatic)

UTILIZATION

There's 3 knobs Bé, no simple + requires a little getting used to if you do not know the RAT, once more config. set-top (as I made the mark on a small sheet ^ ^) ça roule!
the manual offers three settings: blues, lead and heavy, cool but better find yourself his own ^ ^
10 for the sticker sold

SOUND QUALITY

The pedal reacts much to change knob which allows great versatility, the sound is huge vintage, fat rock'n'roll what!
with very little distortion you sound very jazzy simpa (surtt in neck pickup)
you push a little more distortion you get and there's a bluusy, crunch perfect for Hendrix or Chuck Berry (Oh Yeaah!)
12 disto has then there is the sound perfect for vintage classic of the genre (AC / DC, Led Zep ...)
and pushing slowly you go through the nikel more like the White Stripes, RATM to ..
disto you have a background sound preque heavy metal but not too much is not made to play the death ..

EDIT: after many adjustments I managed to find LZE sound system of a down rammstein and even (yes!)

OVERALL OPINION

I love it! I do not spend more! the quality / price exeptionnel he'll be one for each setting! lol