Switch from heating to cooling. The thermoelectric system allows for easy switching from beverage cooler to food warmer! Holds up to eight 12 oz. cans. Ideal size for use at home, in the nursery, office or dorm room – Mom's love the ability to keep milk or formula at the right temperature. Bring your lunch to work in the morning and keep it hot all day. Change from cooling to heating with the flip of a switch!.