Introducing the newest and revolutionary addition to Primo Passi's family, our portable Formula Mixer was developed with parents and babies in mind to quickly mix baby formula to perfection as well as protein shakes, at home or on-the-go.   -- PRODUCT DESCRIPTION Introducing the newest and revolutionary addition to Primo Passi's family. Our portable Formula Mixer was developed with parents and babies in mind to quickly mix baby formula to perfection as well as protein shakes, at home or on the go. This AAA battery powered mixer is tough enough to handle up to 16fl oz of milk or protein shakes. Practical and portable, it works with a simple push of a button.