Dip this Barbie doll into water to see her mermaid tail glimmer with colorful lights inspired by a sparkling rainbow. It's a total wow moment! Simply press the button in Barbie doll's necklace to switch her to on" mode, and dip her into the tub or pool. The colorful light show starts automatically once she is activated by the water. Or bring the magic ashore - you can push the button in Barbie doll's necklace to enjoy the light show without water. She then goes into "sleep" mode after 5 minutes of inactivity. Reactivate with another push of the necklace button for endless storytelling fun. Rainbow fins, a "pearl"-detailed belt, pink-streaked hair and a princess tiara complete the head-to-toe magical mermaid look. Tell all sorts of fantastic fairytales with this gorgeous mermaid doll. 3 AG13 (LR44) Button Cell batteries included.