Wah... so small

Smaller wah, that's right. The one you see here is Mooer's Wahter.

That's how big/ small it is in context.

Actually, folks, those flaps there are foldable so the real Wahter size is really small, it'll sit comfortably on your palm without issues. This is a practical consideration should you need a utility level wah for inclusion's sake. It's optic based so purists out there will tell you it's not gonna be as warm-sounding as a pot-based version.

How little can it be?

It seems that everyone is pushing the boundaries of being small, Mooer included. What you see here are effects pedals approximately half the dimensions of your credit card. So if you are thinking of portability, the prospects of having your preferred line of effects pedals fitted onto an A4 size pedal board is a definite possibility. There is this consideration of small-equals-compromise which is very real; a dedicated processing unit is required if the manufacturer wishes to consider refinements in their electronics & going small isn't going well if this is priority. However, there are many ways to accomplish goodness, if the good people of HOTONE pedals could prove everyone wrong, MOOER might have a case here. We shall reserve judgment till these Spark series pedals get here, yes?