Thermoelectric System - Easy To Switch From Beverage Cooler To Food warmer! It's Recommended To Wait 30 Minutes Before Going From Cold To hot. Change From Cooling To Heating With The Flip Of A Switch! Multi-Size Available - Sleek Size For Use At Home, Nursery, Office Or Dorm Room Outdoor Camping travel. Mom's Love The Ability To Keep Milk Or Formula At The Right temperature. And/Dc and usb adapters included - the mini fridge cooler and warmer comes with ac and dc power adapters. Convenient to use at home and car by plugging the appliance into the car cigarette adapter.