Oh boy, this is terrific. ZenZero stuff is handmade in Tokyo by an Italian gent; the quality is superb. This is perfect chopping board on which to mix your tonal ingredients; use it as a boost or an always-on pre-amp. The G switch offers three different levels of gain, with up to 32dB of boost on tap. The LC and HC switches cut lows and highs respectively with three positions on each. The enormous knob is easily adjustable with your foot on the fly. Stick this in front of your amp and really get it cooking with gas. 

Model: ZenZero One Knob Pony
Made: Tokyo Japan, recent model
Type: pre-amp/booster, mosfet driven
Power: standard 9v supply, 4mA draw approx
Switching: true bypass
Equivalent new street price (approx): $330aud
Mods: none
Accessories: original box and docs
Condition notes: used, no major marks, excellent condition