An RF device has a support structure. The mobile device receives one or more wireless local area network packets transmitted within a range of the mobile device. The independent intensity value substantially improves color resolution. A bristled applicator may be included in the kit for use in applying highlight to the hair. The pulse width is less than about 50 ns, and the step of irradiating irradiates over the spot diameter to produce a mark having a mark depth substantially less than about 10 microns.