I looked into it several years ago. But I was told it does not work on Red hair. I am a natural red head.
I was told it is something to do with the wavelength of the laser and pigment in the hair.
I have not checked again to see if that is still true.
I did have my brows threaded this summer. Wow what a great way to shape my brows, much better than waxing or tweezing.