Its construction is also unique - I'm far from being an expert but this thing runs on an AC power supply, which is unique with non-tube compressors that I know (and I know quite a lot of them - a sucker for compressors:-). It takes a bit of tweaking to make it suit your preferences.What I suggest is set the gain knob high, up to the point that the'comp' led flashes as you hit the strings, put the'ratio' and'attack' knobs at 12 o'clock and start from there, backing the gain knob a bit and balancing output with the'volume' knob. Once you find the sweet spot, you'll never want to turn that thing off again : I personally used it to add a bit of punch and fatness to my sound. There aren't any YT demos of this particular unit. All I could find is the later GC-3 version used with bass - I though I would add it, so at least you will have a taste of the craftsmanship and sound quality of the compressors made by Albit. I have a 230V to 9VAC power supply and you'll get it together with the unit if you're in Europe.
But if you're in the US you need to get a 9VAC adapter that runs at 110V. If you hook it up with a regular 9VDC you will basically fry the thing. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Compressors & Sustainers". The seller is "bwol1" and is located in this country: PL.
This item can be shipped worldwide.