How does the color-change feature work on this Barbie set?

The doll's face and the pet's eyes change color with icy cold and warm water, and the effect can be repeated again and again.

What surprise items are included in the Shimmerin' Hearts set?

The set includes a doll, dress, shoes, a mini pet, dough compound, cake, scoop, spatula, mold tray, and a pet accessory.

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Mattel Barbie Party Unboxed Doll & Accessories, Pet Birthday Series, Shimmerin' Hearts Set - JFG71

10-surprise unboxing: unwrap a stack of 4 gift box-inspired presents to reveal the Shimmerin' Hearts fashion doll and an adorable mini pet puppy with a pet-sized tutu to dress up.
Use the mix-and-make dough compound, mold tray, scoop, and spatula to decorate the included 2-tiered birthday cake.
Color-change transformation on the doll's face and pet's eyes using icy cold and warm water, repeatable again and again.
Includes doll, dress, shoes, mini pet, dough compound, cake, scoop, spatula, mold tray, and pet accessory. Ages 3 and up. Other Pet Birthday Series characters (Birthday Bows, Party Stars) are sold separately as different items.