POWER TO GO PCW861 12 Volt Portable Thermoelectric Cooler/Warmer Portable design plugs directly into your vehicle cigarette lighter socket or other 12 volt power source Thermoelectric operation keeps foods and beverages either cold or warm Insulated housing maintains cold/warmth even after you?ve unplugged it 5 liter capacity keeps a six-pack of your favorite beverage cold or keeps a meal warm for hours Four convenient cup holders built into lid