Booster pedal (Level Power Booster) to be precise, classic 9v power supply via transformer (I never put the battery I do not know if there's room for), mini size (hyper practice prevents).
Output Input IN / OUT.
Normal.

UTILIZATION

Well, one Bitonio ... A manual you say?
Turn the knob, the knob all round and I sing the sound-chan ♪ ♫!
The volume is increasing the more you turn, if it is zero: no sound.

SOUND QUALITY

I squinted over for a while.
Ridiculous price for the gear (20 € secondhand).
I played on a Mustang single-coil pickups, and low output volume level (I keep his microphone if it is not a Mustang item!) Therefore I wanted to boost its volume light, and the muscles in saturation.
This pedal adds the same in medium and severe (and essential fatty acids), suddenly she sounds of thunder, a very good attack, slap it right.
Add a drive or after distortion (in pedal format or amp up to you) if you want bigger sound, guaranteed results.
Coupled with my Boss SD-2, a Engl Screamer Combo, is a killer. The sound spectrum is filled, bass, midrange, treble guitar spring mix without any problems.

OVERALL OPINION

I deppuis uses 15 days, then yes a tube amp is the goal, but to enlarge a distortion of a transistor are all good too!
In the clear, dynamic respected mediums enriched slamming, everything is there.
Push it again and crunch.
Paste it as a distortion of his store and there it goes to the goal.
Some use especially for a cruncher lamps amp, why not me is to warm the sound of my Mustang (which is beautiful, but a bit feeble).
I'm a fan of EHX, it is public so to speak, but it is a mark of very good quality. I just tried this model, the positive opinion lurking on the internet.
Simplicity, practicality (! Tiny) on occasion for a pittance (cereals, spelled as you want), it is a great investment for anyone who wants boost his guitar and fat saturation and it colors the sound seems to be the colors are so successful.
I would do this choice nyeux closed!