The AutoCafe Take Out Hot Cup Warmer keeps drinks hot while you're traveling. Take it with you in your car or truck to keep your drinks at the right temperature during your drive. The coffee mug warmer has a precision temperature heater that can be adjusted as needed. It accommodates paper or styrofoam cups, sizes 12 to 20 oz. This easy-to-use device fits in the cup holders installed by your vehicle's manufacturer.