[ongquang21]

There is something wrong in the label.

At a Frequency of 60 mega hz/second, only IC or... can see the pulse. For the fan? It looks as if as dc.
Again, at a currency of .24 mA (1/1000 Amp) a fan can not even make a turn ( a LED consumes a lot more than that.)

So, i think this label belongs to an IC chip or ...

Suppose it is 12v .24A. then each fan is about 3w. For parallel connection, you need a minimum 2x3w=6w transformer.

Therefore, a 10w 12v DC Transformer is good enough.

Go to the Value Village or Thrift Store buy two AC to DC transformers; one with 12v-10w and the other with 9v-10w.
Try the 12v first. If it is too noisy, try the 9v then.
They are cheap, under $5 each.