Product descriptions:1.Cooling or heating by thermoelectric.2.The best mate for outdoor adventures such as picnic, barbecue, camping and fishing, etc.3.DC 12V for car only or DC 12V & AC 100-240V. 4.Capacity from 4L to 33L. 5.Cooling capacity: 18-22 Degrees centigrade below ambient temperature; heating capacity: up to 65 degrees centigrade.