Junobie's Portable Battery Operated Milk Cooling Cup Whether you are on vacation or headed back to work from maternity leave, having a milk cooling system is of upmost importance. The junobie battery operated portable  milk cooling cup is equipped with semi-conduction refrigeration technology that allows breastmilk to rapidly cool while on-the-go.  The junobie SMART cooling cup provides up to 9 ounces of breastmilk or formula storage, and compares to having a refrigerator in the palm of your hand. The cooling cup is  perfect for use when traveling, on-the-go to leisure activities such as  camping/hiking, at the bedside, or use for heading back to work.