I think we are here in the presence of a digital pedal.
Connectivity is standard, except for battery power that does not disconnect (yes it is rather nerd)
Changing the location of the negative wire is very easy to achieve.

UTILIZATION

Not truly possible need for manual
The choice of 3x2 different types of reverb is quite simple

SOUND QUALITY

Used with a low sound is correct, meets quite well the sound of the instrument, do not add too high frequencies.

OVERALL OPINION

I should say that value for money is excelent but it is down ...
FAILURE appears to be quite FREQUENT:
Symptoms: whistling noises chuttes, which sometimes happens to stop by connecting repeatedly food.
A correction is this failure: Replace transistor D331 by BS170 (next to the power plug).
Caution: this operation is delicate and is not feasible for everyone.
The circuit is double-sided, the welds are very small and close to each other.
To me this does not solve the problem truly possible.
The problem moves along the power used (battery, 12volt 9.10 ..)

Despite good preformances the sound level, I AGAINST this pedal is completely unreliable.

Made in China .... shame
(Small red square: side of a weld the other 2 on the other side)