Multi-purpose Portable Drink, Juice and Cocktail Mixer - Electric Protein Shaker Powerful and portable clear mixing container for easy view. Built-in mixer automatically mixes drinks with the press of a button. Perfect for mixing juices, cocktails, coffees, teas, protein shakes and formulas. 400 ml/14 oz capacity with leak-proof lid. Easy to clean. Battery-powered. Requires 2 AAA batteries (not included).