... free, no compressor 2. Cool and warm 3. Certificate: CE, ROHS, GS, UL,EMC, TUV,ISO 4. Capacity:4L Portable electronic cooling ... and warming box seriesWith advanced semi-conductor refridgraton technology, the ... It is very easy for use.It has both cooling and warming functions: to make cold drinks in ... mini fridge for car /cooler & warmer/ cooling box