L'Oreal Paris Colorsonic Permanent Hair Dye Coloring Device for Root Touch Up, All Over Color, and Gray Coverage, Mistake-Free Application (Hair Color Cartridge Sold Separately)Pick, Pop, Press: The next evolution in hair dye innovation, pick your favorite LOreal hair color cartridge (sold separately), pop it into the Colorsonic device, and press. This hair dye device makes permanent hair dye as easy as brushing your hair Easy To Use Hair Coloring Kit: Get salon worthy hair color at the press of a button. This revolutionary hair coloring device automatically mixes color, parts your hair, and saturates every strand to ensure