1,Unlike ordinary household refrigerators with compressor refrigeration, car refrigerators are cooled by electronic chips, using PN junctions made of special semiconductor materials to form thermocouple pairs, which produce a Peltier effect, a new type of refrigeration method through DC refrigeration. The temperature range is 5 to 65 degrees. 2,It can not only cool but also heat, 25 degrees at normal temperature, 5-6 degrees for cooling, and 60-65 degrees for heating (the specific temperature varies depending on the ambient temperature). 3,No need for refrigerant refrigeration (both compression and absorption), environmentally friendly, non-polluting, small size, low cost, no vibration, noise, long life 4,The cooling temperature is affected by the ambient temperature, and the cooling cannot reach below zero. It is only suitable for keeping fresh and keeping warm. 5,Suitable for fresh-keeping storage and insulation of beverages, food, fruit, milk, red wine, low-temperature drugs.