beautiful but, to avoid slow speed ....

As usual with amazon, the description is not enough to know how it works exactly.
So first, know that the blue LEDs flash at low speed, and it flashes increases with the speed of the fan.
To stop at maximum speed, single position or the LEDs will be fun to watch.
In flashing mode, it becomes very quickly unbearable.
So banish if it is for coupling to a Rhéobus.

I finally plugged into the motherboard, or it rotates constantly floor (775 rpm), since not equipped with a pin 4 pins (essential for the system to control the fan speed, specify for beginners like me)
Otherwise, even thoroughly, relatively quiet.