A gain knob
switch
battery or mains power supply

UTILIZATION

It sets the level of boost with the gain and it knob sending potato

SOUND QUALITY

Superb, it produces a boost Fully transparent
Set up the sound of the original is preserved,
when the gain is cranked, really at an end of knob,
Legre a saturation appears, but this setting is to boost the windows exploded
point zero sound has a volume that itch that comes out of pedals is before or scrapes (in fact it is far more ffective at the end of string)
I use it mostly with a rglage medium or a little less than half to boost solos without too much difference in level with the rhythm

OVERALL OPINION

I use it for good 5 years, strong as a tank (requires MXR)
it works great.
Booster trs ffective to restore the juice after 35 pedals, or to calm a drummer too enterprising