Question 1

What does it mean by with reduced speed?

Accepted Answer

The features section points out that two connectors are 5V & the other two are 12V.  The 5V connectors don't provide as much electrical potential as the the 12Volters, thus they allow, or make, a fan run slower.  Maybe for the really big fans or noisy ones, or just to burn less coal.

Question 2

what ones are the 0.5v and what ones are the 12v?

Accepted Answer

There are two with yellow wires and two with red wires. I'm not entirely sure which is which voltage, but the yellow wires produce a faster fan speed and the red wires a reduced speed.

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