The technology used in the Tria Hair Removal 4X gives you permanent hair removal, not hair reduction. The Diode Laser contains a particular wavelength that is optimised for permanent results. Its energy is specifically targeted to the hair follicle, giving you accurate results that are permanent. The Tria Laser 4X is suitable for most skin tones and hair colours. More effective than IPL technology, it is a safe, effective treatment that offers you permanent results.