The Isotherm Travel Box 18 Portable Refrigerator / Freezer is portable, versatile & efficient!The TB18 is compact outside and spacious inside like a thermoelectric fridge, but it performs at both deep freezer and refrigerator temperatures. The new BD Micro 1.4F by SECOP (formerly Danfoss) is a compressor with integrated control electronics; it regulates the speed according to the temperature set on the thermostat and the inside of the refrigerator, reducing consumption to a minimum. Set the temperature you desire to quickly freeze fresh catch, chill beverages to their preferred temperature, or carry delicate medicines that require refrigeration on their travels. Light and compact, the Travel Box 18 can accompany you on all your adventures, whether it's on the boat or in the car.Features:Lightweight & compact constructionInjection-molded walls & doorDigital displayAdjustable shoulder strapCigarette lighter plugThree-stage battery protectionIntelligent Temperature ControlIntelligent Soft-StartAutomatic Turbo Cooling (MAX mode)Low battery consumption (ECO mode)Specifications:Capacity: 18L (0.64 cu.ft)Temperature Range: 0F-50FVoltage: 12/24V