Nutrabolt Vortex Portable Mixer v 2.0.0, 18 fl oz BPA Free; Stainless Steal and Acrylic; Pre-workout; Eggs. Cocktails; Juice; Baby formula; Energy drinks; Protein; Lemonade and more The ultimate portable mixer The Vortex is powered by a 11,000 rpm motor that tears through the thickest powders with ease Your days of drinking clumpy protein and shaking cups up and down are over Requires 2 AAA batteries