To use Stellar Gurl, you can take her outside on a sunny or cloudy day, or just put her near a window indoors. Then, wait and watch her hair color change from blue to purple and other cool colors. When unboxing, handle the accessories carefully as they are small. After playing, keep her in a dry place to maintain her color - changing ability. And remember, this doll is for kids aged 4 and up, so adult supervision might be needed for younger kids to avoid any small - part choking hazards.