What does the number on hair dryers mean?

I have a couple of hair dryers, each one of them has a different number on it. I'm not sure if it's the power or something? One says 6000 etc.





What do those numbers mean? Do the hair dryers with a higher number work best when blow-drying hair straight?





Thanks.What does the number on hair dryers mean?
ask a ahirdresser

zits