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It's a wah wah, with a knob to select the frequency range concerned by the effect, a selector for use with bass or guitar.
Very solid all-metal, all trust.

UTILIZATION

Is pressed, the effect is warming up (wow), with the volume pot range you can have an effect that is very (very) dull to very loud.
the effect is not super progressive, it's more than wwwwwwwwwwwwaaaahhh wwwwwaaaaahhhhh, so 2 points less.
Oh, and no trouble as the trigger on my baby cry.

SOUND QUALITY

Pile hair what I wanted, ie a wha a bit more customizable than the cry baby and also more present.
As stated above you can go for great deaf to very loud, it's perfect.
Comes out clean in both disto.
I use it with guitars (humbuckers and singles) on lamps and Kustom amp disto Palmer.
I can get kind of sounds like Morello Adam Jones, so it's all good.

OVERALL OPINION

I use it for a few days before that I tried to Ibanez WD7 wah one and a cry baby (as well as wahs of multis), it is that I intend to keep (or to his then APW7 Wish function).
The pros: sturdy, easy to trigger, versatility, sound.
The -: not quite progressive.