Moo Mixer says “Moo” every time you mix up your chocolate milk. Simply push the trigger button to activate the internal mixing whisk. While your drink is being whirled into a spinning vortex of fun, a beautiful bellowing “moo” will be heard. Mixing action runs on two AAs (not included). Moo sound runs on button cell batteries (INCLUDED). Dishwasher safe clear tumbler. Includes lid for safe drinking.