TOPCHANCES NEW Portable Protein Shaker Multi-purpose Mixer Tornado Mixer 450ml Stirring Cup(White) 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 Battery-powered. Requires 2 AAA batteries (not included) 450 ml/16 oz capacity with leak-proof lid. Easy to clean